Convert your 7900GT into a 256Mb 7900GTX

[aussie-revhead]

OK I see now , pardon my noobness , this looks out of the reach of a noob like me , and Im not sure where I would get components like these here anyway .

Can I use the other volt mod shown elsewhere for 7900GT ? Can you also point me to a vmem mod ? Do you believe that vmem mod is going to kill my card , as I read elsewhere ?

[t024484]

OK I see now , pardon my noobness , this looks out of the reach of a noob like me , and Im not sure where I would get components like these here anyway .

Can I use the other volt mod shown elsewhere for 7900GT ? Can you also point me to a vmem mod ? Do you believe that vmem mod is going to kill my card , as I read elsewhere ?

Use the latest most simple variant of the voltmod, and forget about Vmem modding.

[aussie-revhead]

With so many pages on this subject , could you please point me to the lastest most simple version of the volt mod? Will gpu volt mod also increase my mem clocks? I currently get 600/800 in standard form with ATItool . What is safe max vgpu for water cooled vid card? I got just under 10000 in 3D05 with a 146 , so my E6400 will help that .

I will try 1.55v mod for sure but considering 1.7 ( except for the soldering )

[t024484]

With so many pages on this subject , could you please point me to the lastest most simple version of the volt mod? Will gpu volt mod also increase my mem clocks? I currently get 600/800 in standard form with ATItool . What is safe max vgpu for water cooled vid card? I got just under 10000 in 3D05 with a 146 , so my E6400 will help that .

I will try 1.55v mod for sure but considering 1.7 ( except for the soldering )

Look in this thread http://www.xtremesystems.org/forums/...ad.php?t=94177. First print the pictures in posting 640 page26, and then read posting 2 Page1, posting 500 page20 and posting 543 page 22.

[aussie-revhead]

Thanks for that , here is a pic of a modded card that looks very well done , but what do they all do ?

http://www.ocforums.com/showthread.php?t=454737

Or what about this one ? This looks much easier than yours , but 1.55 max :

http://forum.overclockers.com.au/sho...3&postcount=58

And these pics look informative :

http://sg.vr-zone.com/?i=3330&s=2

[t024484]

Thanks for that , here is a pic of a modded card that looks very well done , but what do they all do ?

http://www.ocforums.com/showthread.php?t=454737

Or what about this one ? This looks much easier than yours , but 1.55 max :

http://forum.overclockers.com.au/sho...3&postcount=58

And these pics look informative :

http://sg.vr-zone.com/?i=3330&s=2

Read better. No one has found an easier way to voltmod than I did.
In the picture shown it is the lower of the three mods. No connection to ground is needed. If you want to go beyond 1.55Volt ( why should you ?) you also have to replace a resistor changing the base from 1.2 to 1.5Volt.

[aussie-revhead]

The mod on ocau forum looks easier than yours , when I find the source pic I will post it .



Here , in post 133 :

http://www.ocforums.com/showthread.php?t=454737&page=5

[aussie-revhead]

Is there a bios for my 512 Calibre to allow use of this switching mod ?

Can you tell me what vid cards have this hardware already on them ? You mentin EVGA 7900GT SS , are there any others ? I was told elsewhere that all late 7900GT and 7600GT have dual voltages , is this correct ?

[t024484]

The mod on ocau forum looks easier than yours , when I find the source pic I will post it .



Here , in post 133 :

http://www.ocforums.com/showthread.php?t=454737&page=5

If it looks easier to you , it is because you haven't read well. Sorry, no offend, but it is a fact.
You keep asking questions, which is completely O.K., but you do not take the time to really understand things. Make one step at the time and not twenty.
The only 7900 boards that I know of that are switching their GPU voltage are the 7900GTX and a few EVGA 7900GT boards.
To answer your Bios question, look into your Bios with Nibitor, and see if this option is available, then check with Rivatuner if the VID is really switching.
But again, why do you want to know this if you are not going to solder those extra components, and why do you want to go beyond 1.55 Volt.
Take my advice, start with a GPU voltmod to 1.5 Volt. This is just connecting two sets of two points together. Forget the Vmem mod, and see to what frequency your board is working troublefree.
Eventually after having done that, you could increase the conversion frequency by pencil modding and thats it. Go no further if you are not a skilled soldering guy.

[aussie-revhead]

I am sorry if I ask too many questions , I can not afford to blow up my vid card but I love overclockign and benchmarking , so I am ambitious .

I will first do 1.5 mod then see where we go from there . If switching is available I may look at soldering the extra components .

My pc isnt running yet so I cant look at bios yet , but I will .

Thank you for your help .

[Demo]

@aussie-revhead

t024484's mod is quite simple also but it does have a draw back of having to remember which trace to remove if you want to step down a few volts, as for that volt mod you posted it has an advantage of using masking tapes to act as a "bridge" so you can toggle the mod on and off.. altho that mod is a bit hard for first timers who use conductive ink ( not pen )

Click for image ( 1600x1200 )

[aussie-revhead]

You laid the tape down before you drew the conductive lines so you can peel the tape off and break the lines ? Not bad , but is there a way to attach a small switch to the pcb without soldering ? I wouldnt mind attaching a switch to disable the 1.55 mod when its not needed , to extend vid card life . I thought all those soldering pics looked Ok until I looked at the card and saw how small all those bits are .

Its a crap drawing , but this is what I mean :

vidcard switch.bmp

Why does this file get bigger when I shrink it ?

[t024484]

You laid the tape down before you drew the conductive lines so you can peel the tape off and break the lines ? Not bad , but is there a way to attach a small switch to the pcb without soldering ? I wouldnt mind attaching a switch to disable the 1.55 mod when its not needed , to extend vid card life . I thought all those soldering pics looked Ok until I looked at the card and saw how small all those bits are .

You are in the wrong thread, go to the sticky.

[aussie-revhead]

That was in reply to Demos post , but thanks .

[Demo]

That switching method can also work, and yes i placed the masking tape b4 i draw the connection.

[wildcard]

Silly question, what are you supposed to do at those colored locations? Connect them together (the two points within the color code)? attach a 50k resistor? Something else?

This wasn't immediately clear to me.

Thanks!

Red gives you +0.05 Volt
Yellow gives +0.1 Volt
Purple gives +0.2 Volt

[t024484]

Silly question, what are you supposed to do at those colored locations? Connect them together (the two points within the color code)? attach a 50k resistor? Something else?

This wasn't immediately clear to me.

Thanks!

connect them

[Orion24]

All right, I went to the local supplier with the ordering page of Farnell.com and said he could place the order for these items. I ordered them in quantities of 10 and 5, so I have some spears; but it was only until I heard the price I had to pay: 81 Euros! Oh man! You should have seen my face when I heard it. These cost 1-2 Euros in Farnell.com. I decreased the order to 5 & 5 quantities (minimum I could order)

[Orion24]

OK done it for my first 7900GT and works. Nice guide here.

Only note is that modding my existing XFX BIOS with the advanced voltage editor of NBITOR didn't do anything. VID 0 and VID 1 both game me 1.2V, or there has been no voltage switching. Maybe the correct VID for here was 2,3 or 4, or maybe the BIOS editor did not properly work. Eitherway I had to use the EVGA BIOS.

Now, time to mod the second 7900GT

[Roger_D25]

Unfortunetly not all cards/BIOS can be modified for separate 2d/3d voltages. If I'm not mistaken I believe that the card in question needs to have certain components installed for this to be possible?

[t024484]

Unfortunetly not all cards/BIOS can be modified for separate 2d/3d voltages. If I'm not mistaken I believe that the card in question needs to have certain components installed for this to be possible?

You are probably wrong. All 7900Gt boards can be modified, of course with the exception of those boards that have already been modified by the supplier
like the EVGA SS.
And if your BIOS does not switch the VID correctly. simply use the EVGA BIOS.

[Roger_D25]

Thanks for the correction t024484, I have assumed for sometime now that you had to modify both the card and BIOS to get the 2d/3d voltage change to occur on cards that didn't come that way? For example with my 2nd RMA'ed 7900GT (7900GT CO) I actually tried flashing the BIOS with the eVGA 7900GT SS version hoping to get the separate 2d/3d voltage changes. Unfortunetly nothing happened (had 1.2v on both 2d/3d), from what I understand it would have been possible but only by modifying the card with some additional components, and then modifying the BIOS.

I could have misunderstood Orian24 but I thought he was asking if it was possible by only modifying BIOS? In fact you are one of the few people who have come up with a step-by-step method for adding the correct hardware so that their non-switching cards can switch voltages in 2d/3d modes?

On a different note, it is possible to modify my 7900GT SS card's 3d voltage, (which already has the added components for separate 2d/3d voltage switching) so that it goes from the stock level of 1.45v to say 1.5v or 1.55v corerct? I have a feeling you have explained this many times but I have been unable to piece the info together enough to make it happen.

Do you remember if you have already posted this info t024484 in this thread or on extremesystems somewhere? You certainly don't have to explain it once again but if you could point me in the right direction that would be great!

[t024484]

Thanks for the correction t024484, I have assumed for sometime now that you had to modify both the card and BIOS to get the 2d/3d voltage change to occur on cards that didn't come that way? For example with my 2nd RMA'ed 7900GT (7900GT CO) I actually tried flashing the BIOS with the eVGA 7900GT SS version hoping to get the separate 2d/3d voltage changes. Unfortunetly nothing happened (had 1.2v on both 2d/3d), from what I understand it would have been possible but only by modifying the card with some additional components, and then modifying the BIOS.

I could have misunderstood Orian24 but I thought he was asking if it was possible by only modifying BIOS? In fact you are one of the few people who have come up with a step-by-step method for adding the correct hardware so that their non-switching cards can switch voltages in 2d/3d modes?

On a different note, it is possible to modify my 7900GT SS card's 3d voltage, (which already has the added components for separate 2d/3d voltage switching) so that it goes from the stock level of 1.45v to say 1.5v or 1.55v corerct? I have a feeling you have explained this many times but I have been unable to piece the info together enough to make it happen.

Do you remember if you have already posted this info t024484 in this thread or on extremesystems somewhere? You certainly don't have to explain it once again but if you could point me in the right direction that would be great!

You are right, you have to modify the board, and you need the right Bios to make use of the added hardware. Only modding the hardware brings nothing, and installing the right Bios on an unmodded card does also nothing.
The extra hardware are switches, and those switches have to be switched by the right Bios.

It is very well possible to make an SS board switch to a higher voltage than the factory installed 1.45Volt. Look at the second picture in posting #1 of this thread. EVGA has already made the purple and the the red connection, giving you 0.2 + 0.05 volt extra over the 1.2 Volt, totalling to 1.45 Volt.
If you additionally make the yellow connection, you will add another 0.1 Volt giving you 1.55 Volt.

[Roger_D25]

After comparing my card to those pictures earlier today (and before I read your recent post) I came to the same conclusion but thought there was no way it was that easy, lol! I'm going to give it a try tonight, thanks again for taking the time to re-explain that for the thousandth time, lol! I should have pulled my card first to compare it before posting that question as I probably could have done it on my own.

[Demo]

I've been running my Inno3D 7900GT at 1.55v with VF900Cu-Led a few days after i got it since July 04,2006 would it be safe to assume that my card is in good working order ? been running at 650/800.