all vmod for all 6800

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Originally Posted by luks__pl

I have problems with my card :( It's a Leadtek 6800GT AGP. On 1,3V everything is ok I can o/c on AC to 415/1150 and to 440/1190 on peltier+WC. When I change voltage to 1,4V I get screen corruptions, and resets.

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I have the same problem (Leadtek 6800GT)

at stock (1.3v) everything is fine, and i can do 425/1110 stable (1.35v measured). If i flash a 1.4v bios the card gets unstable and the screen corrupts under load. I replaced the crappy thermal pad on the small heatsink over the (?)vregs with thermalpaste and now the heatsink gets nice and hot under load. 1.4v works for longer now, but i still get screen corruption if i loop Gametest 4 of 3dmark03 :(
Guess the regs are just too weak :(

Is there a way to pencil mod (temporary) vmem for 6800nu AGP?

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Originally Posted by ***Deimos***

Is there a way to pencil mod (temporary) vmem for 6800nu AGP?

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Not exactly pencil mods (AFAIK), but VERY easy anyway:

http://www.xtremesystems.org/forums/...ad.php?t=62651

.. if your card is using that PCB.

Ive digged trough this whole thread trying to find a mosfet/caps/... mod for the 6800GT 256mb AGP, and I did found info, but because I'm a noob at electronics I diden't understand it.
What I'm asking now is if you guys could give me some (highres)pictures of a 6800GT on which I can see where to solder the caps/mosfets/... and what caps/mosfets/... it must be.
Ill take these pictures to a vmodder I know and he will solder the stuff for me.
Sorry to ask these "do everything for me" questions, but I must still learn a lot about electronics.

Thank you very much,
JochenP

You know that Vmem mod where you put 5-10K resistor between TP13 and TP14.. well now I have a dead 6800.

I found a 10K resistor from old pcb, unsoldered it, measured again carefully, bent the pins so that they went straight down, inserted into TP13 & TP14, and powered up. Correct expected 2.76V showed up on memory (vs 2.71V). But no beep, no boot no nothing.. fans are spining, and all the TP show correct volts for memory and gpu. Dunno what went wrong :/

Did you allready try to unsolder it again Deimos?

Also I have a dead 6800GT PCI-E. My father Vmodded it for me, and this is how it looks like: http://users.skynet.be/fb254489/IMG_0422.JPG
The Vcore regelator has an 8k resistor to ground so the card get's 1.4V (with ultra bios). With an self added 100k resistor in parallel the core wil get around 1.68V, because the total resistance lowers to around 7,4kOhm. On my picture u see also an 1M variable resistor in series with the 100k resistor. Lowering the parallel resistance will give higher Vcore, so I've added the 1M var. resistor so I am able to regulate between 1.68V and 1.4V, but I'm not able to go above 1.68V so I can not overvoltage the core by turning to quick on the variable resistor.
This should work fine in theory.

Real life went little different... When al was modded I messured the Vcore resistor. With var resistor @ 1MOhm I got +- 8kOhm, and with var resistor @ 0MOhm I got 7,5kOhm. Great, it works! But when I installed the card in my pc nothing had changed. I messured Vcore and got 1.53V. That's because I still have the 1.5V bios mod. Hardware mod is not working at all. Deinstalled and messured Vcore resistor and got 8kOhm no matter what resistance the variable resistor has.

So I guess bad contact. Luckely my card still works. So then I went to do some soldering myself. After few attempts I gave up. Aldo I was able to solder the resistors on the card, I was always having some kind of bad contact because when I messured total Vcore resistor I always got 8kOhm :s
Then I just put the mod resistors on the right spot, messured... everything good, I'm messuring 7,5kOhm... Okay, some glue on it...and...wait...
F*cking glue didnt went dry at all. After 15minutes I gave up. My hand hurts from staying in same positions that long... "Maybe I should give my daddy another shot" I thought. So I cleaned up as much glue as I was still able, and then put card back into PC without Vmod.
Booted, nice... butt wait...no screen :(
Everything stays black, monitor stays in standby, but pc is starting up and loading Windows. Messured Vcore: 0,8V
F*ck!

What can I do about it??? I'm pretty sure it's only that one resistor wich regulates Vcore.

Also this mod sucks because we had a hard time finding a good spot on the Vcore resistor to solder on... Is this normal?

I wasted a sweet 9500np that softmoded perfectly to 9700 doing something similar to vgpu. I was soldering to legs of vreg chip and slipped and got some solder under the legs... I omfg almost fell out of the kitchen chair! I just couldn't get the solder out from there. I tried holding it upside down and holding soldering iron to max on that spot... weird contortion.. Eventually got it off but look like I slipped and burned a bit of the pcb... what happened after that was week long story of card working and not working and back and forth till I ran out of bypass legroom.

ok i'm currently reading through the whole thread(on page 8 right now) since i'm getting water on this card soon and want to do the vmem mod and also the voltage mod for the gpu(1.7v's maybe). i have a couple of quick questions to direct me in the do it or not do it variety. i have posted a couple of pics of my temps and voltages as recorded in ASUS SmartDoctor for reference to my personal current temps with a tornado blowing on the stock copper heat sink(i have it right on it so there's a dead spot i need to clear by finding a way to move the fan out a little).

1. what is the max temp i should see on average for the ram.

2. i have the asus 6800gt that came on an Ultra PCB so i already have the extra molex connector and caps that came with the Ultra so do i still need to do the cap mod?

3. is it safe to use AS5 when i put individual heatsinks on the ram and every thing else that can take a heatsink?

that's it. the rest i'll keep reading and learning what i need to do for my GT to get my o/c up on both the gpu/mem. i've had it as high as 460/1170 with fastwrites off and 425(or 430 can't rememer)/1140 with fastwrites enabled. currently running bios modded 400/1100. thanks for any helpful replies. and now for the pic:

http://img359.imageshack.us/img359/1...ed1copy1mv.jpghttp://img299.imageshack.us/img299/9...ed2copy4ht.jpg
http://img396.imageshack.us/img396/8362/v9999gel1am.jpg

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that's it. the rest i'll keep reading and learning what i need to do for my GT to get my o/c up on both the gpu/mem. i've had it as high as 460/1170 with fastwrites off and 425(or 430 can't rememer)/1140 with fastwrites enabled. currently running bios modded 400/1100

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You have an incredible card. Consider yourself fortunate... stock, on air - wow. Is that like 460/350 = 31.4% faster over stock?

1. Max on RAM... without hotspots even 60C should be fine. Those BGA chips dont put out as much heat as the GPU.. in general if you keep the GPU cooler, you'll notice the bga's cooler too (after all, the heat just conducts throught the numerous traces)

2. Cap mod is for people who get black screen after running game for a few min... its worse in some games, and hard to notice in others... best theory now is that its caused by inadequate capacitors on 6800le and 6800nu - so, it doesnt affect you.

3. I personally dont know, although I have put globs of AS5 between NV5 and my 6800, for both GPU and the bga's. I'm wondering if perhaps I got some under them, since get internal clock test failure pretty close to stock speed... I got some very nice heavy duty fine tool cleaner
As long as you keep the stuff on the ceramic/heatsink then its fine.. try to avoid bridging contacts.

thanks for the prompt reply. looks like i'll just be doing the hard volt mods for the mem/gpu only then. just waiting till i get the water setup ordered and in my hands.

oh on the 460/1170 that isn't a regular occurance with this card. i was able to bench 2k1 and 05' with it but 03' was a no go also. sometimes a freeze then continue or straight up error out. i'm looking to get 440/1180-1200 all benches stable and cool to run 24/7.

waterblock for the gpu and sinks for everything that even looks like it can take one. even if it doesn't need it. also maybe some kind of mod to have a quite 120mm fan blowin over the back of the card to keep things even cooler. i'm not rebuilding until the AMD M2 so it's gotta play everything until then 1600x1200 with at least 4xaa 16xaf:D

Hey kryptobs2000, I saw you soldered some caps to your 6800Gt but unsoldered em again. Was this because they screwed up the card or why? And what caps did you use?

Thnx,
JochenP

Although cooling the gpu, and mem will lower overall temperature of the card, dont forget about all the voltage regulator circuitry. Specifically, there are 2-3 IC at bottom right corner of the card which get very hot. As well, on opposite side there is some transistors that get hot and are covered by heatsink for 6800ultra.. dont know bout your card though..

i'll have to check it out then. i know it has that back plate for the heat sink but is there something else that covers the back of the card that your talking about? i still plan on heat sinking everything and having a 120mm blowning on the back of the card.

can someone make it a little clearer what i have to do to do the vmem mod?
i.e. say where exactly to solder the variable resistor to, what resistance it needs to get a safe bump in voltage and what the measuring points are. my card is an inno3d 6800nu. im more than capable of modding the card, ive done motherboards and other gfx cards, i just find this guide very hard to understand what to solder where.

if required i can get a pic of my card and someone could mark where im to solder.

thanks

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Originally Posted by zipp0r

can someone make it a little clearer what i have to do to do the vmem mod?
i.e. say where exactly to solder the variable resistor to, what resistance it needs to get a safe bump in voltage and what the measuring points are. my card is an inno3d 6800nu. im more than capable of modding the card, ive done motherboards and other gfx cards, i just find this guide very hard to understand what to solder where.

if required i can get a pic of my card and someone could mark where im to solder.

thanks

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Hi,

EASY Vmem mod for many 6800/6800le-cards. Is your card similar ?

http://img216.echo.cx/img216/4646/vmemmod16ir.th.jpg

(original thread for this, having also comments about Vcore modification)

http://www.xtremesystems.org/forums/...ad.php?t=62651

Yes, I am talking about all the little IC chips in SikaRippa's previous post... specifically the bottom ones which get the hotest. If you have good heatsinks on them your "ambient" temperature read through nVidia driver should decrease a lot. However, be very careful, as all of them are not offset the same level from the board. As suggestion, if you have old Athlon/P3 heatsink or f you have a nice chipset heatsink you could cut up and use that...

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Originally Posted by ***Deimos***

Yes, I am talking about all the little IC chips in SikaRippa's previous post... specifically the bottom ones which get the hotest. If you have good heatsinks on them your "ambient" temperature read through nVidia driver should decrease a lot. However, be very careful, as all of them are not offset the same level from the board. As suggestion, if you have old Athlon/P3 heatsink or f you have a nice chipset heatsink you could cut up and use that...

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You are absolutely correct: the components of this card are running very hot. In fact not only the MOSFET's but also capacitors and coils.

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For those really interesting about temperatures.. I have measured skin temperatures of relevant components as follows. I installed (with glue) a Pt100-sensor (very linear/accurate electrical temperature sensor) at the end of wooden stick. I pressed extremely gently manner this sensor to the top of each component for proper time (for stabilization of temperature, ~ 10 s) and measure corresponding resistance. The measurement error should less that a few degrees, and I suppose all values are HIGHER that measured. I will later 'publish' all results in 'Black screen document', but here comes preliminay result acquired from MSI 6800le-card.

Below is a foto of measured temperatures for a idle state and second of during heavy load (Aquamark03).
http://img312.imageshack.us/img312/8...emp18ul.th.jpg

It can be clearly seen that the load has a huge effect to some components. Also the temperature of MOSFET's powering Vcore indicates (three IC's at the very bottom) they are running VERY hot i.e. some heatsinks would be nice.

Just imagine if you were a designer of these PCB's and you had the luxury to make limited edition run of specially catered to overclocking boards. Very good clean signals, negligble crosstalk or coupling capacitance, and user redundant components... Why have 1 FET heat up to 70C if you can use 3 and have them only heat up to 40C. Having a special limited edition board like that would be really sweet! :^)

But, till then, we have to make do with what me have here.

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Originally Posted by SikaRippa

Hi,

EASY Vmem mod for many 6800/6800le-cards. Is your card similar ?

http://img216.echo.cx/img216/4646/vmemmod16ir.th.jpg

(original thread for this, having also comments about Vcore modification)

http://www.xtremesystems.org/forums/...ad.php?t=62651

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it looks the same, here is my card front and back:

http://img24.imageshack.us/img24/303...copy2on.th.jpg

http://img185.imageshack.us/img185/7...copy9qc.th.jpg

can you draw on my photos, where to connect the variable resistor and where i am to solder an old molex connector so i can measure the voltage. i still dont understand your diagram :o
i think i have some variable resistors here, a 1k ohm, a 5k ohm (might be 500ohm tho cant remember ), and a 10k ohm. which one should i use? what is the default voltage? 2.7v ? what should i aim for 2.8v? and would that get me to 900mhz on the ram? its stuck at 800mhz at the moment.

thanks

I am going to regret doing this, since if you obviously can't follow SilkaRippa's excellent guide then you probably shouldn't be doing this in the first place.

http://img.photobucket.com/albums/v6...a/vddr-mod.jpg
Measure at blue test point, connect POT across TP13-TP14. Please read SilkaRippa's guide carefully (if you still haven't read it).

Quote:

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Originally Posted by ***Deimos***

I am going to regret doing this, since if you obviously can't follow SilkaRippa's excellent guide then you probably shouldn't be doing this in the first place.

http://img.photobucket.com/albums/v6...a/vddr-mod.jpg
Measure at blue test point, connect POT across TP13-TP14. Please read SilkaRippa's guide carefully (if you still haven't read it).

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it just confuses me thats all, but i understand from you now, where to solder to and measure from. :)

from his graph, is my default voltage, 2.758v ? and i need to set VR to 4700ohm to get 2.822v or 3300ohm to get 2.85v. which do you think would safely get me to 900mhz?


thnx

Quote:

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Originally Posted by zipp0r

it just confuses me thats all, but i understand from you now, where to solder to and measure from. :)

from his graph, is my default voltage, 2.758v ? and i need to set VR to 4700ohm to get 2.822v or 3300ohm to get 2.85v. which do you think would safely get me to 900mhz?


thnx

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There are at least two alternatives WHY you acquired different value

- Measurement accuracy
- Your card HAS higher stock voltage

I wonder the absolute values of resistors that set voltage to VREF node are not too different from those I (and many others) have measured. Therefore, you could make the mod quite safely with a variable resistor having a HIGH initial value (>20 kohm) AND measuring Vmem value while adjusting resistor. A fixed resistor (e.g. 6800 ohm) in series makes this modding even more safe.

If you want to be ABSOLUTELY sure about resistance values: measure resitances between TP14-GND and TP14-TP13 and post those values here.

Remember: DO NOT MEASURE RESISTANCE WHEN POWER IS ON

Quote:

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Originally Posted by zipp0r

it just confuses me thats all, but i understand from you now, where to solder to and measure from. :)

from his graph, is my default voltage, 2.758v ? and i need to set VR to 4700ohm to get 2.822v or 3300ohm to get 2.85v. which do you think would safely get me to 900mhz?


thnx

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I cant see any perfection on this topic- if a card has AC cooler you cant see those TP points and please where is the core regulating VR in your picture?I also cant see why things must be told as vdd+vddq- isnt there a more human way?

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Originally Posted by soodent

I cant see any perfection on this topic- if a card has AC cooler you cant see those TP points and please where is the core regulating VR in your picture?I also cant see why things must be told as vdd+vddq- isnt there a more human way?

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Hi,

Nobody is perferct ... BTW what figure you mean ?

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Here is figure for TP's

http://img148.imageshack.us/img148/3...tps28bf.th.jpg

TP1=TP10 (memory voltage)
TP11 (GPU voltage, small resistor <1 ohm between TP11 and Vcore)
TP12 (FB for Vcore, NODE for VMOD !! resistor between TP12 and GND)
TP3, TP5 (VTT/VREF voltages)
TP9 = GND (also some other TP's)

Really i am confused about this topic.I tell what i get so far.
1.Only one regulator is needed(100k) however first post says 2.
2.In first post some yellow dots- dont know what and why.
3.This 1 regulator controls both core and mem volt but somehow everybody is talking about Vmeme or Vcore changes in their posts (not both at the same time).
4.Vvdq- unknown to me.
5.Exact value of regulator depends on spesific cards components- only logical thing yet.