7800GTX overclocks with Volt Mods??

Even a monkey will understand these pictures... http://xtremesystems.org/forums/show...191#post947191

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Originally Posted by Huigie

Even a monkey will understand these pictures... http://xtremesystems.org/forums/show...191#post947191

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yes they are good the pictures. but what happens if some one forgets to up the resistance on the trimmer before booting the computer they will be at risk of over volting the GPU(that why a guide like malves or a thread with tech nical help will be a good idea).. i have done some research and i will be modding my sisters card and my brothers new card when he gets it. and my card of course. my sisters card is alot faster than mine.

I did the vgpu mod and it seems to be working great. after i finished benching i put the resistance back up.

what is the highest recommended load volts for water cooling?

here is what i was getting

528mhz
1.42v 3D
1.21v 2D

550mhz
1.51v 3D
1.29v 2D

579mhz
1.56v 3D
1.34v 2D

After looking at this thread and others on different forums, it appears that some people have had issues using some of the mods for the 7800GTX (ie it has been rumoured at some places that these mods can result in a non-functioning card), whereas other people appear to have had success using these mods.

Can everyone/anyone who has done mods on their cards post here (or PM me) with information about which mods you followed (with a link to the mods), the result of the mods (ie if the mods were successful, and before/after clocks if known), and pictures of your modded card if possible.

By doing this, i'm hoping to clear up the confusion about whether these mods are correct, and to prove (or disprove) that they are working.

mod works, at least raises voltages anyway. I'm pretty sure VJ's ground was what did his card in. I've removed mods for 24/7 use...i don't like raising all three voltages at once...if a bios mod comes out that only deos the 2 3d clocks, or a mod for each mode, then i'll do it.

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Originally Posted by cadaveca

mod works, at least raises voltages anyway. I'm pretty sure VJ's ground was what did his card in. I've removed mods for 24/7 use...i don't like raising all three voltages at once...if a bios mod comes out that only deos the 2 3d clocks, or a mod for each mode, then i'll do it.

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Ground is ground and the shorter you keep the connections to the ground plane the better.

The card worked fine and looked great. It just wouldn't render using hardware. It had nothing to do with the volt mods.

Viper

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Originally Posted by persivore

After looking at this thread and others on different forums, it appears that some people have had issues using some of the mods for the 7800GTX (ie it has been rumoured at some places that these mods can result in a non-functioning card), whereas other people appear to have had success using these mods.

Can everyone/anyone who has done mods on their cards post here (or PM me) with information about which mods you followed (with a link to the mods), the result of the mods (ie if the mods were successful, and before/after clocks if known), and pictures of your modded card if possible.

By doing this, i'm hoping to clear up the confusion about whether these mods are correct, and to prove (or disprove) that they are working.

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The mods work just as intended. This isn't rocket science. All that is happening with them is altering the existing feedback circuit voltage dividers to reduce the voltage sensed at the feed back pin of the regulator. The regulator senses the lower voltage at the feedback and phases the mosfets on more to increase the target voltage at the PS output. This also increases the voltage at the feedback pin until the regulator is fat dumb and happy. Extremely basis stuff.

What isn't known is the G70 tolerance to running with increased Vcore. It is well known the 6800's didn't like large moderate to large Vcore bumps. The cores on the 7800 might not be particularly like them either.

Viper

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Originally Posted by ViperJohn

The mods work just as intended. This isn't rocket science. All that is happening with them is altering the existing feedback circuit voltage dividers to reduce the voltage sensed at the feed back pin of the regulator. The regulator senses the lower voltage at the feedback and phases the mosfets on more to increase the target voltage at the PS output. This also increases the voltage at the feedback pin until the regulator is fat dumb and happy. Extremely basis stuff.

What isn't known is the G70 tolerance to running with increased Vcore. It was well know the 6800's didn't like large moderate to large Vcore bumps. The cores on the 7800 might not be particularly like them either.

Viper

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are u sure that its not some sort of throttleing? i found out that the forceware 77.76 drivers remove the issue on sub 35°C temps (80.40 dont btw) - maybe they could help

Quote:

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Originally Posted by ViperJohn

The mods work just as intended. This isn't rocket science. All that is happening with them is altering the existing feedback circuit voltage dividers to reduce the voltage sensed at the feed back pin of the regulator. The regulator senses the lower voltage at the feedback and phases the mosfets on more to increase the target voltage at the PS output. This also increases the voltage at the feedback pin until the regulator is fat dumb and happy. Extremely basis stuff.

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I understand exactly how the mod works, and the the mods look as tho they should work perfectly fine to me, but I was trying to clear up the fact that I have seen many people (probably more than I've seen say that they actually work) say that the mods kill cards.

I was never doubting the fact that the mods weren't working, but I was trying to make it clear to people who were in doubt about the mods ;) .

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Originally Posted by persivore

I understand exactly how the mod works, and the the mods look as tho they should work perfectly fine to me, but I was trying to clear up the fact that I have seen many people (probably more than I've seen say that they actually work) say that the mods kill cards.

I was never doubting the fact that the mods weren't working, but I was trying to make it clear to people who were in doubt about the mods ;) .

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Hi Persivore

The mods do work as intended and came from Jason57 through an undisclosed source. There was an NDA in effect for a while.

I haven't seen the other threads but the mods themselves wouldn't be killing the cards. To high a Vcore might as the G70's tolerance to Vcore increases isn't well known.

The NV40's were not particularly tolerant of high Vcore on average and the G70's may well be the same. The key is just what is the limit of the Vcore increase the core can handle and not the method of achieving it.

Be it making the regulator think the Vcore is low by lowering the voltage at the regulators feedback pin or changing the VID programming the end result is the same...increased Vcore to the GPU. As they say Vcore is Vcore is Vcore.

Can you point me to some of the other threads please?

Viper

isnt the g70 just a more optimized nv40 core? that means it may not have a high tolerance, or like some ati cards, it could possibly be vcore hungry.

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Originally Posted by W0nderb0y

isnt the g70 just a more optimized nv40 core? that means it may not have a high tolerance, or like some ati cards, it could possibly be vcore hungry.

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The G40's (and most likely the G70's) didn't respond to more than about 9-10% Vcore increase. I had many G40 cards where the core OC went backwards with Vcore above 1.550 even on high end WC. Depending on the ATI core 17-20% is pretty standard before they wall up.

The key with the G70's is most likely moderation when it comes to increasing the Vcore.

Viper

IMO the mods are working fine. I have also recieved some pm's about the mods. I really think the main problem might be that some have done the mods and thrown on H2O cooling then had a worse score or bench. This being due to thermal throttleing (the modded bios on these forums worked for me) (apparently a set of non-fm approved drivers also works). Or pushing the OC too far causing the card to downclock. Just my opinion. :)

These are some of the threads that I remember seeing...I think there might have been some more somewhere, but I can't remember where.

http://www.ocxtreme.org/forumenus/showthread.php?t=675
http://www.xtremeresources.com/forum...ad.php?t=37362 (I'm not sure if there's anything about mods killing cards here)
http://xtremeresources.com/forums/sh...ad.php?t=37563

Thanks for confirming that the mods are working Harleybro...Hopefully that will help people if they were in doubt about the mods :)

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Originally Posted by persivore

These are some of the threads that I remember seeing...I think there might have been some more somewhere, but I can't remember where.

http://www.ocxtreme.org/forumenus/showthread.php?t=675
http://www.xtremeresources.com/forum...ad.php?t=37362 (I'm not sure if there's anything about mods killing cards here)
http://xtremeresources.com/forums/sh...ad.php?t=37563

Thanks for confirming that the mods are working Harleybro...Hopefully that will help people if they were in doubt about the mods :)

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Thanks for the links and will read through them.

What we need is a database of the Vcore's run so we can see at what level problems start to show up from the Vcore being to high.

Viper

Quote:

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Originally Posted by persivore

These are some of the threads that I remember seeing...I think there might have been some more somewhere, but I can't remember where.

http://www.ocxtreme.org/forumenus/showthread.php?t=675
http://www.xtremeresources.com/forum...ad.php?t=37362 (I'm not sure if there's anything about mods killing cards here)
http://xtremeresources.com/forums/sh...ad.php?t=37563

Thanks for confirming that the mods are working Harleybro...Hopefully that will help people if they were in doubt about the mods :)

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Okay just ran through the forums. I just love the instant engineers with there lack of knowledge, rampant speculation and wild jumps to conclusions. Every volt mod picture I have seen are the same as above with only different points for the ground pickup and of course ugly leads that pickup and inject EMI/RFI noise directly into the regulators feedback circuit.

Viper

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Originally Posted by ViperJohn

Okay just ran through the forums. I just love the instant engineers with there lack of knowledge, rampant speculation and wild jumps to conclusions. Every volt mod picture I have seen are the same as above with only different points for the ground pickup and of course ugly leads that pickup and inject EMI/RFI noise directly into the regulators feedback circuit.

Viper

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actually, i'm pretty sure most of the pics out there are yours.....lol


the rest are with different grounds. Thought maybe your ground caused a bit of feedback on that phase, but i don't know nothing. :fact:

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Originally Posted by cadaveca

actually, i'm pretty sure most of the pics out there are yours.....lol


the rest are with different grounds. Thought maybe your ground caused a bit of feedback on that phase, but i don't know nothing. :fact:

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I have seen my pictures several times. The mods themselves kindly came from Jason57 after the NDA ran out. Now the only company that I could imagine having an NDA on a 7800 volt mod would be nVidia lol. The mods are most likely straight out of the lab. They are pretty straight forward when you trace the circuits out.

Viper

yeah, i guess. i was advised psenn, psenp, and grounded on the chip itself. ;) had to figure the rest out myself. But you did that for me. thanks.

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Originally Posted by happyhero

well i did tell him not to vmod it untill there is a guide on how to do it successfull. i am going to do my card as soon as i have enough knollege, still waiting for some one to make a guide some where on the net. over at extreme resources they know how to do the volt mod but won't tell any one.

EDIT: just found malves vmod guide and it looks good to give it a try.

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why is it such a big secret?????????

3d teams getting more competetive now :D

-CaT

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Originally Posted by CaTalyst.X

3d teams getting more competetive now :D

-CaT

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all the teams already know how to do the mod! so why not share?

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Originally Posted by cheap

all the teams already know how to do the mod! so why not share?

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My thought exactly.

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Originally Posted by ViperJohn

Here are the as modded Vcore pictures. The trimmer is a 200 ohm, 25 turn and gives a .050
Vcore bump at full resistance. Adjustment is extremely smooth with very high resolution.
.001 volt changes are easy to dial in.

The Vcore metering point is the clip post soldered at C792 in the 3rd picture.

Viper

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lo there, right ive got a quick question, im tryin 2 track down some 200ohm VRs here in the UK but i jus aint avin any luck, all i can find is 200R VRs 15 turn pots, is this the correct value?

shigs

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Originally Posted by shigs

lo there, right ive got a quick question, im tryin 2 track down some 200ohm VRs here in the UK but i jus aint avin any luck, all i can find is 200R VRs 15 turn pots, is this the correct value?

shigs

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Yu got a URL on those so I can look at them???

Viper

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Originally Posted by ViperJohn

Yu got a URL on those so I can look at them???

Viper

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Model number: 3266W-1-201 BOURNS

CERMET POTENTIOMETER ROHS COMPLIANT:NO; SERIES:3266; RESISTANCE MAX.:200OHM; RESISTANCE MIN.:2OHM; RESISTANCE TOLERANCE:+/- 10 %; NUMBER OF TURNS:12; POWER RATING:0.25W; PACKAGING:BULK; TERMINAL TYPE:PCB; ADJUSTMENT TYPE:TRIMMER; RESISTANCE:200OHM

Found here:

http://www.newark.com/NewarkWebComme...ction&x=12&y=7

Shigs is gonna do the vmods for me and these are the units we selected here in the UK.

Check it out and post your thoughts on yes/no here.

Many thanks in advance Viper John

Also: When making the mods - does it matter what BIOS is installed? For example if the 'no temp monitoring' BIOS was installed would this have any effect of the mod itself?

Cheers again

Mav

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Originally Posted by ViperJohn

Yu got a URL on those so I can look at them???

Viper

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I am using a 200r resister for my 7800GTX.
i can only turn it 1 ful revolution so i have to be carefull when i am upping the voltage.

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Originally Posted by maverik-sg1

Model number: 3266W-1-201 BOURNS

CERMET POTENTIOMETER ROHS COMPLIANT:NO; SERIES:3266; RESISTANCE MAX.:200OHM; RESISTANCE MIN.:2OHM; RESISTANCE TOLERANCE:+/- 10 %; NUMBER OF TURNS:12; POWER RATING:0.25W; PACKAGING:BULK; TERMINAL TYPE:PCB; ADJUSTMENT TYPE:TRIMMER; RESISTANCE:200OHM

Found here:

http://www.newark.com/NewarkWebComme...ction&x=12&y=7

Shigs is gonna do the vmods for me and these are the units we selected here in the UK.

Check it out and post your thoughts on yes/no here.

Many thanks in advance Viper John

Also: When making the mods - does it matter what BIOS is installed? For example if the 'no temp monitoring' BIOS was installed would this have any effect of the mod itself?

Cheers again

Mav

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This is a better choice:

http://www.newark.com/NewarkWebComme...KU=03F3876&N=0

Viper

Hi Viper John - the only difference I can see is the power rating from 0.25w to 0.5w, I dont think we can get hold of the 0.5w unit in the UK - if we use a 0.25w unit and it blows - is it safe to ssume that the unit will just refer back to default voltages?

Cheers

MAv

For the (few) volt-mods I`ve done, I`ve taken it that no real power is dissipated through the resistor/potentiometer, so rating doesnt matter?

Please dont take that as hard truth, I`ve never checked..

Kenny :)

The variable resistors that ViperJohn pointed out have 25 turns instead of 12, so the voltage adjustment with them will be finer ;)

mmmmm I am just looking to set it at 1.5v-1.65v, the goal is to get 615Mhz core clock on water - so dont think I need a fine adjustment - although with teh benfit of now knowing this - I would go for the 25 turn in future.

Thanks for the information guys - just waiting for confirmation from the Viper man to see if 0.25w is okay?

Cheers

Mav

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Originally Posted by maverik-sg1

Hi Viper John - the only difference I can see is the power rating from 0.25w to 0.5w, I dont think we can get hold of the 0.5w unit in the UK - if we use a 0.25w unit and it blows - is it safe to ssume that the unit will just refer back to default voltages?

Cheers

MAv

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The power rating of the trimmer is of no consequence. The difference is the 3296 is a 25 turn unit and the style allows the trimmer to be attached right at the mod site with double sided foam tape with the trim pot legs going to the solder points without adding noise inducing lead wires.

Viper

I see thanks for the input Viper J - You da man!!

Quote:

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Originally Posted by maverik-sg1

I see thanks for the input Viper J - You da man!!

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Also I would limit your Vcore to 1.60 at least for now. The G70's tolerance to increased Vcore is not well known yet. It is well known the NV40 cores were not to keen on running and living with the higher Vcores.

It is better to go easy on the Vcore at first until more data is available.

Viper

fair commetn viper J - thanks for the heads up. Mav

Are these the same mods just wired different? I'm too noob to tell :(

http://www.ocxtreme.org/forumenus/sh...07&postcount=1

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Originally Posted by MUCHO

Are these the same mods just wired different? I'm too noob to tell :(

http://www.ocxtreme.org/forumenus/sh...07&postcount=1

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Yes with just a dumb ground connection. The ground plane on the card and chassis ground are the same thing just two different places.

Viper

using a 200ohm resisitor as advised - what is the max voltage you can produce at the full 200ohms?

Can anyone advise the voltage at given resistances (25ohm, 50ohm, 75ohm, 100ohm, 125ohm, 150ohm, 200ohm etc....)

A nice voltage versus resistance guide would be most excellent.

Cheers

Mav

2fast for you over at another forum posted

"Card testing is all done and vmods are good and stable at 1.804 VGPU / 2.25 VDDR"

But I think he is using a waterchiller to -16 - it's a safe bet that 1.6ish volts is the max for water probably 1.5ish for air?

I hd no problem doing around 1.75 or so on ice water. Now all these posts about running 1.8v doesn't OVP kick in around there?

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Originally Posted by harleybro

I hd no problem doing around 1.75 or so on ice water. Now all these posts about running 1.8v doesn't OVP kick in around there?

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Interesting 1.75v on ice water so i am guessing water temps around 16degrees, what clocks were you able to achieve?

What volts did you settle for for 24/7 watercooling?

Quote:

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Originally Posted by maverik-sg1

using a 200ohm resisitor as advised - what is the max voltage you can produce at the full 200ohms?

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I hope you realise that low resistances produce higher voltages, for all i know 25ohm could kill the card instantly.
Be careful! Always start out with the highest resistance.

Quote:

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Originally Posted by Gogar

I hope you realise that low resistances produce higher voltages, for all i know 25ohm could kill the card instantly.
Be careful! Always start out with the highest resistance.

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It would lol.

Viper

Quote:

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Originally Posted by maverik-sg1

using a 200ohm resisitor as advised - what is the max voltage you can produce at the full 200ohms?

Can anyone advise the voltage at given resistances (25ohm, 50ohm, 75ohm, 100ohm, 125ohm, 150ohm, 200ohm etc....)

A nice voltage versus resistance guide would be most excellent.

Cheers

Mav

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You can't do it that way. Tolerances in the regulator and components allow a fairly wide range in the Vcore at a given resistance.

So far with stone stock card I have seen the 1.4 vcore vary from 1.409 to 1.446.

You do not go by resistance, except for installing the pot at max resistance initially, or by counting pot turns. You use a known accurate DVM. If you do not have one you should not be volt modding anything.

Viper

I see your point viper J, my cards are set in SLI and I struggle for space to get the meter in when inside the case, so setting the resistance to a predetermined level would be ideal for me - but it's not impossible to do each card on there own first, volts to be adjusted in windows not BIOS or DOS right?

Got me a DVM which is accurate - max volts looks like 1.5v on air (very good air cooling that is) 1.65v max on water (although 1.6 for 24/7) and 1.8 volts for subzero cooling.

Just to clarify one thing - when these are installed the resistor is set to max resistance for normal volts and then resistance is lowered to increase the volts to the core?

Cheers

Mav

Quote:

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Originally Posted by maverik-sg1

Just to clarify one thing - when these are installed the resistor is set to max resistance for normal volts and then resistance is lowered to increase the volts to the core?

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Yes that is correct lower the resistance to get higher voltages.. I run my card at 1.7v when bench testing and 1.48v for everyday use. I did leave the voltage at 1.74v for 5 day 24/7 untill I realized and then lowered the voltages again. Normal watercooling.

Quote:

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Originally Posted by Tamille

Yes that is correct lower the resistance to get higher voltages.. I run my card at 1.7v when bench testing and 1.48v for everyday use. I did leave the voltage at 1.74v for 5 day 24/7 untill I realized and then lowered the voltages again. Normal watercooling.

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Excellent - what watercooling are you using (blocks rads etc..) and what temps do you get under load at those voltages?

What clocks have you been able to achieve?

Cheers

MAv

Quote:

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Originally Posted by maverik-sg1

it's not impossible to do each card on there own first.

Mav

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That doesn't make any sense. Mod one card at a time then volt set then find the OC for it. Mod the second card and do the same thing on it's own.

After you have the OC's for both remember the OC for the slowest card and run both cards at that when you setup the SLI.

Yes you set the Vcore in Windows. You have to have the Windows drivers loaded as it is the drivers that read bios voltage table and actually set the cards Vcore as the operating mode changes (2D - LP3D - HP3D )

Viper

Quote:

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Originally Posted by maverik-sg1

Excellent - what watercooling are you using (blocks rads etc..) and what temps do you get under load at those voltages?

What clocks have you been able to achieve?

Cheers

MAv

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eheim 1250
gpu = Silverprop Fusion HL
cpu = Silverprop Cyclone Evolution SE
rad = Black Ice Extreme II
temps are a max of 40~ full load.

@ Viper J - sorry mate, I relaised what I had said after I already posted and will set up individually before going SLI.

Cheers

Mav

goign to be trying this tonight using viper johns pics as a guide. Ill show you how i do too

phil

Hello to all, this is my very first post! I have a quick question in relation to my XFX 7800GTX. I have never completed a vmod on any piece of hardware until this card. I am a very keen and avid computer user, also a computer technition, and are confident when it comes to soldering. I studied this mod very carefully and conducted it only last week. I used Viper John's method, and it works perfectly, although I'm a little unsure about the voltages. I used the exact components shown and soldered them in exactly the same places. After booting successfully I tested voltages while sitting idle in windows, and it shows the following:

Vmem: 2.165, Vcore: 1.285

From what i've seen im happy with the mem voltage, which is around what everyone else has from what ive seen on many forums. But everyone is talking about a core voltage of 1.4 @ stock. I'm not even getting 1.3v. Are ppl talking about voltage while the card is running a 3d app? or when idle in windows? Just to clear up a few things... Sorry for the n00b questions as I'm unsure and dont really want to fry it if i dont have to. Any feedback would be appreciated.

Thanks
Mark

:confused:

Quote:

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Originally Posted by ssg3000

Hello to all, this is my very first post! I have a quick question in relation to my XFX 7800GTX. I have never completed a vmod on any piece of hardware until this card. I am a very keen and avid computer user, also a computer technition, and are confident when it comes to soldering. I studied this mod very carefully and conducted it only last week. I used Viper John's method, and it works perfectly, although I'm a little unsure about the voltages. I used the exact components shown and soldered them in exactly the same places. After booting successfully I tested voltages while sitting idle in windows, and it shows the following:

Vmem: 2.165, Vcore: 1.285

From what i've seen im happy with the mem voltage, which is around what everyone else has from what ive seen on many forums. But everyone is talking about a core voltage of 1.4 @ stock. I'm not even getting 1.3v. Are ppl talking about voltage while the card is running a 3d app? or when idle in windows? Just to clear up a few things... Sorry for the n00b questions as I'm unsure and dont really want to fry it if i dont have to. Any feedback would be appreciated.

Thanks
Mark

:confused:

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on the 7800GTX's the stock 2d voltage is 1.2v and the 3d voltage is 1.4v. Your Vgpu should increase to about 1.4v once the card enters 3d mode :)

Ahhh ok I thought it may be something along those lines. So ill just run 3dmark05 and then test the voltage. Sweet.. Thankyou very much for ur help persivore.

Mark

I just did the voltmod

On 1,5v it did 540 instead of 510. But then, 1,52v it just turned off. When i turned it back on, it had artifacts, on the desktop. And it still has.

R.i.p :'( ?

Quote:

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Originally Posted by DesertShooter

I just did the voltmod

On 1,5v it did 540 instead of 510. But then, 1,52v it just turned off. When i turned it back on, it had artifacts, on the desktop. And it still has.

R.i.p :'( ?

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What were you using for GPU cooling???

Viper

Boxed heatsink with 2 80mm fan's.

I monitored the temperature, and it didn't reach the 60 C. (stressed)

Quote:

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Originally Posted by DesertShooter

Boxed heatsink with 2 80mm fan's.

I monitored the temperature, and it didn't reach the 60 C. (stressed)

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Well some cards are just genetically destined at birth to have a short lifespan.

Viper

i just ordered these parts for the volt mod
BOURNS INC. 3296W-1-201 200ohm gpu mod
BOURNS INC. 3296W-1-101 100ohm memory mod
i think these are right for the job. both are 25 turn units. i am going to do the gpu first as i am able to up to 1420 on stock volts. my gpu high 3d load volt is 1.449 and i can get 499. i probably will not go over 1.5 as i am aircooling this unit. if these are not the right parts let me know. thanks for the great work and as always mod at you own risk.

Quote:

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Originally Posted by cronic

i just ordered these parts for the volt mod
BOURNS INC. 3296W-1-201 200ohm gpu mod
BOURNS INC. 3296W-1-101 100ohm memory mod
i think these are right for the job. both are 25 turn units. i am going to do the gpu first as i am able to up to 1420 on stock volts. my gpu high 3d load volt is 1.449 and i can get 499. i probably will not go over 1.5 as i am aircooling this unit. if these are not the right parts let me know. thanks for the great work and as always mod at you own risk.

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NO!!!!!!!!!!!!

That should be a 3296W-1-104 100K for the memory. At 100 ohms all you will have is instant smoke.

Viper

glad i asked then. i'll get the right one one the way. thanks for your help. i'll keep you updated.

ok, i did the gpu volt mod. i set it at 200ohm and reinstalled. system booted up fine. i had 1.27 2d voltage and 1.49 3d load voltage. i decieded to turn the pot (while it was running) and one of the solder joints broke loose. i immediatly turnrd the system off. took the bourns off and reinstalled it. no go. so i had a guy who is an expert solder the unit on and still no go. it reads .013 volts at the gpu voltage read point. have i fried my card? is it fixable? i can add pics if that will help. PLEASE HELP!

anybody want to buy a dead bfg 7800 gtx? 175.00 OBO I stress the obo. let me know

Quote:

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Originally Posted by cronic

anybody want to buy a dead bfg 7800 gtx? 175.00 OBO I stress the obo. let me know

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Sorry to hear about the card :(, but please don't sell outside of the classifieds :slapass:

It might be able to work again dont give up that fast =)

Is there any other ground point to solder at except that small pad ?

Quote:

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Originally Posted by cronic

anybody want to buy a dead bfg 7800 gtx? 175.00 OBO I stress the obo. let me know

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You sure its dead not shorting out ?
I looked at the pic you posted, if you look carefully I wonder if the solder there is making contact possibly causing short. If the card has protection, maybe it would not start up too protect itself from possbile short.
Look at the pic you added, I put red dot right below the area that looks to be shorting out on pcb.

http://img226.imageshack.us/img226/9...c0005918qf.gif

Quote:

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Originally Posted by cronic

anybody want to buy a dead bfg 7800 gtx? 175.00 OBO I stress the obo. let me know

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How about taking off the memories and put on a new 7800gtx? The spot's are there :D will assume 512mb with no prob ????

Quote:

---

Originally Posted by VoRtAn_MaDgE

How about taking off the memories and put on a new 7800gtx? The spot's are there :D will assume 512mb with no prob ????

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i had not thought about that. would the memory controller see the 512mb. i actually just bought a used 6800 ultra for a steal. i think i will probably use the 6800 until the next gen nivida cards are released. so i will let this 7800 go. the board looked better before i took the pot off and played areound. i looked at it under a scope and it definitly was not shorting. not sure what happened. all i know is i gotta get my rig back up and going. thanks

Quote:

---

Originally Posted by MickeyMouse

Cronic next time pay someone to do it.
I myself will mod a card and test it first if it dies anytime while I have it I buy the card. With services around the world like this "not just me" $50-100 for a card to mod u that you pay $600 for is cheap :)
I can pull like 5 names off the front page of the 3dmark orb who;s cards ive done. doesnt mean these guys or even yourself cant do it, but to have insurance and have it done right is a huge plus in this community which is overclocking. :)

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i agree completlty. the guy who normally does this sort of thing for me was out of town when the parts came in. so dummy me decieded to give it a go.
MISTAKE!.
oh well an expensive lesson learned i guess.

Sometimes its good to practice soldering on some old pcb just to get it down packed. Even though I been soldering for years, I still have my sloppy moments and go do some practice runs on an old mobo then do the actual mod. Then again I mod old stuff, just for the fun of it and practice of course. :p:

P.S:Jason I seen some of your mods around and I have to say your very
professional at modding...congrats. :toast:

Quote:

---

Originally Posted by cronic

ok, i did the gpu volt mod. i set it at 200ohm and reinstalled. system booted up fine. i had 1.27 2d voltage and 1.49 3d load voltage. i decieded to turn the pot (while it was running) and one of the solder joints broke loose. i immediatly turnrd the system off. took the bourns off and reinstalled it. no go. so i had a guy who is an expert solder the unit on and still no go. it reads .013 volts at the gpu voltage read point. have i fried my card? is it fixable? i can add pics if that will help. PLEASE HELP!

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When the pot leg tore away it probably took part of the trace with it. The PCB is probably repairable.

Viper

Apology for my very bad English knowledge, but I hopes that you can nevertheless to help me

I likewise put the mass of the measuring points on the mass of the trimmers.
Should so actually function.

Now I have however a prolem:

The measured values of Vcore and Vdimm are not correct.

~ 0.83 Vdimm
~ 0.95 Vcore

If I now to turn on the trimmer, then change nothing on the Vcore. Except that a Vdimm is suddenly selected of ~ 0.01. Circuit analyzer and cable ok. Where does the problem lie and/or where am I to ground the measuring points?

I have worked exactly after the guidance of Viperjohn.

Quote:

---

Originally Posted by Hitman47

Apology for my very bad English knowledge, but I hopes that you can nevertheless to help me

I likewise put the mass of the measuring points on the mass of the trimmers.
Should so actually function.

Now I have however a prolem:

The measured values of Vcore and Vdimm are not correct.

~ 0.83 Vdimm
~ 0.95 Vcore

If I now to the trimmer turn change as well as nothing. Except that a Vdimm is suddenly selected of ~ 0.01. Circuit analyzer and cable ok. Where does the problem lie and/or where am I to ground the measuring points?

I have worked exactly after the guidance of Viperjohn.

---

In circuit measured resistances are meaningless and if the PWA's traces are damages (open or bridges) that makes it even less usable.

Viper

Its mean that my graphiccard is damaged?

With you the measurement with the circuit analyzer folds?

Hello Hitman 47,

Take some photos of your mod for us and place them on here so we can see what you've done. It will help a lot.

Thanks
Mark

:)

I've done the mod today on my BFG cards, I will post up some results when they come. Tried to make it look at ViperJohn like as possible!

Okay, I went ahead and did it, my vgpu was 1.5V afterwards, then I go to turn the pot, and it popped right off! bad solder joint =*( voltage dropped down to 1.43 otherwise everythign was ok. I'll have to wait until tomorrow to try out that card again. Time to try out the one I actually know I did a good soldering job on (2nd card)

Just took it out to have a look, apparently the entire solder pad side of the C525 ripped clean off! anyone have an idea what the value of this cap is? I mean be best off to replace it if I ever want to try this mod on that card again.

okay so edit #5 or so:

so, the cap itself #525 is okay, I have decided if i want to do vgpu mod I'll be taking a wire out to the edge of the card. However, on BOTH of my cards, I managed to pull off BOTH of the attachment points for the mod, so I am currently stuck at the stock voltages! I am wary to try the "other" version of the mod because I haven't seen any confirmation of it working . VDD mod went okay on both cards, so for now I'm stuck... I would buzz out looking for another available place to do the solder point, but I lost my pads! Thanks to anyone that can find it for me

Weee and others,

I've noticed a lot of you have had problems with the Variable Resisitors coming off after you solder them on. I don't know if you guys took notice to what Viper John has done his mod, but he has used Sticky double sided pads.. or cut strips of 1-2mm thick double sided tape to the same size as the variable resistor which holds the resistors in place on the back of the GFX. I did exactly as Viper John has in his pics and had no problems, it actually holds them on very firmly. This tape is readily available in most electronic stores. Just letting you guys know it works quite well through my experiences.

Mark

:stick:

I don't know if i personally would put superglue on the back of my card, but I guess if your willing to solder on VR's then your already voiding warranty so who cares :p

:toast:

Hooray For LOCTITE :D

Hey, Thanks for the advice... I actually used some double sided foam tape to secure the pots, but it was too porous and didn't hold the parts secure, i had just grabbed it from some stuff that came w/ my cold cathode kit.

I think the main problem with what I did was the fact that on the vGPU mod I used a pot who's turner comes out of the side.

Here's a photo albeit unclear, it is the best one I have

http://i13.photobucket.com/albums/a270/djaziz/VMOD.jpg

Both mods looked pretty much identical.

Couple with the fact that my pot was basically 90degrees to the solder joint and the give in the foam I used, the lateral stress caused the solder joints to break. I tested out both cards and they both clock as high as they used to before the vmod, so I am not terribly devastated just yet. I also had a chance to use the vdd mod to help out my good core clocking but poor memory clocking card.

Before:
http://service.futuremark.com/compare?3dm05=1222782

After:
http://service.futuremark.com/compare?3dm05=1253199

Unfortunately, I was hoping to get the better gains on the GPU clock because my grafx are peltier cooled and when only one is on the loop, I get about 6C load temps, I figured I could push these cards fairly far individually =\

So,

If anyone could reply with some advice to get the mods to work or shoot me a PM with some advice, it is much appreciated!

Edit:I can take photos if needed!

I moved the rest of this into the next post once I got a better picture

Sorry, Just to verify,

It is my belief that these 4 points are all electrically connected, and I was hoping someone would verify in this thread if they have done a connectivity test, just to remove all confusion about the mod.

http://i13.photobucket.com/albums/a2...z/b362709e.jpg

Where do you have grounded the measuring points now?

I do believe that this is the reason, that the measurement does not supply correct values.
The Voltmod actually seems to function, if I turn the VR e.g. on 0 ohms and/or too far, the graphiccard switches off itself.

Could you please tell me your measured values of vcore and vdimm at booting time?


I did the mod in the other way:

In my case the potentiometers and installation voltmeter are in an external console over the case.

At my graphiccard there are only soldered wires. But these wires are ok: no short-circuits or too high resistance. Approx.. 0.6 ohms
Voltmeter is ok, too

I use the ground on the pci-express connector to do my voltage measurements. at boot up I used to get 1.213V and now I get about 1.27V, after boot up i used to get 1.413 and now I get 1.483. By the way, attaching to the smd component shown above seems to have solved my lost pad problem

Quote:

---

Originally Posted by Weee

Sorry, Just to verify,

It is my belief that these 4 points are all electrically connected, and I was hoping someone would verify in this thread if they have done a connectivity test, just to remove all confusion about the mod.

http://i13.photobucket.com/albums/a2...z/b362709e.jpg

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You are correct.

Viper

Alright, here are my numbers after one night of playing.

http://service.futuremark.com/compare?3dm05=1259173

Need a much better cooling for ram solution still, hard to get fans around my liquid cooling tubes on the graphics in a case!

ah yes, forgot to mention, this is at 1.52vGPU and 2.45 Vdd

Can anyone show me a good ground point, i dont want to use that little pad on card that i have seen on guide.
And im kinda lost where to find that guide again from Viperjohn.
I am going to use cables and set VR at power connection and one at monitor connection.

Hoooah nice score =)
Im happy if i will hit 10500 on air.

(OT..will my avatar upset US people ?)

Another possibly useful piece of info for someone out there, on one of my two cards, I do not have the ISL6592 but this:

http://i13.photobucket.com/albums/a2...z/d2c48997.jpg

volt mod works fine, the card is a BFG 7800GTX

What is the max voltage for gpu on air? (given whatever temps). Also, why does my 100K ohm resistor not give me a good margin of adjustment? It goes from 1.45ish straight to 1.6+ without anything between. Its a 100K OHM 64W-104 cerment 25-turn.

Quote:

---

Originally Posted by Gaaya

What is the max voltage for gpu on air? (given whatever temps). Also, why does my 100K ohm resistor not give me a good margin of adjustment? It goes from 1.45ish straight to 1.6+ without anything between. Its a 100K OHM 64W-104 cerment 25-turn.

---

100k is for the memory volt mod. You use a 200 ohm on the Vcore mod. A 100k on the Vcore mod should have had no effect at all in the mod was done correctly so double check the trimmer value.

Viper

Quote:

---

Originally Posted by MickeyMouse

Gaaya you dont use a 100k, lmfao

you sue a 100ohm VR

100k=100,000ohm
100=100ohms
you 'MUST" ONLY USE A LESS THAN 200OHM VR FOR VGPU.
lucky your card didnt fry.

100k you can use for the VDD

---

An extremely confusing post. Use 100k for Vmem and 200 ohm for Vcore...nothing else.

Viper

Quote:

---

Originally Posted by MickeyMouse

LOL, I was one of the founders of the vgpu mod ;)
100ohms and 50k work fine for the mods, but yeah 200ohm and 100k work for more safer voltages.

not confusing looking at it from his stand point as he was fixed on a 100k ohm vr.

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Oh please. The thread was started by one of my customers July 1st. You showed up in late September LONG after the work was done lol.

100 ohm on the Vcore would give a minimum of about 1.610 loaded HP3D Vcore which is a bit high.

Viper

Ok after going threw this long thread i'm confused about where to attach these mods or the right way.

I just finally got my Bourns parts in the mail today a few mins ago:

3296w-1-201 200 ohms
3296-w-1-104 100K ohms

The mail man delivered it to the wrong house last Sat.. saying that the lable was mostly torn away and theres another street with a simular name.. Bull crap i tell ya.. but i'm happy i finally got the package!.. Only after calling the post office atleast 4 times till someone would finally call me back with some news.

Just a post number or link will do..

Thanks

Quote:

---

Originally Posted by ViperJohn

Oh please. The thread was started by one of my customers July 1st. You showed up in late September LONG after the work was done lol.

100 ohm on the Vcore would give a minimum of about 1.610 loaded HP3D Vcore which is a bit high.

Viper

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Hey VJ yeah I think you didn't realize MM is Jason57. I know he was one of the mod founders since I had a modded card from him before the thread started. ;)

This is from post #29 in this thread. :)


Quote:
Originally Posted by symbolized?
Very nice... well done
Only Vcore is missing to make me completely happy - on vrzone a guy reached with a vcore mod 630 mhz on air... :-/


That is Jason57. We have emailed a couple of time. The card did a tad over 11k on dry ice. It appears to be an exceptionally good card but there isn't enoygh data yet to know what are going to be poor, average, good and "oh my god" cards yet in the luck of the draw.

This is all nice an all guys.. but can anyone point out the post with the correct methid so i can get these mods started on my 2 7800GTXs?? LOL!

No i mean which GPU mod is the better way?

This what my WHOLE point in making the post that I did Mr. Eclypse! Showing the four dots and the points are equivalent, verified by Mr. ViperJohn himself, I was trying to help the masses, but one slipped through the cracks =(

Yup noticed your post on that Wee..

Ok so i would want somewhere around 1.5-1.7v for the gpu under water and what would be a range for the vmem?

I must once again say that I love the volt mods, first time I ever did one, and I am super happy w/ the results (i'd be sure you already know how to solder though!)

http://service.futuremark.com/compare?3dm05=1268751

cores at 1.62, mem at 2.6V approx on both cards