6800 GS volt mod!

B

BigAndy

New member
For some of you it will be daft question, but for me it's something new...

At the moment i still with 6800 GS and i would like to do some volt moding.

The problem is i don't know HOW, never in my life did any vmod's. I was searching through Google, but couldn't find anything decent (or maybe i missed it). If anyone can give me some advice or point some web site, it would be much appreciate.

Thanks!

Ok, i found this one:

http://sg.vr-zone.com/?i=3027

But now i'm must find some place where to buy 10K and 20K ohms variable resistor's :nerdtypin .

Look's like i could get some resistors from Maplin's:

http://www.maplin.co.uk/Module.aspx?ModuleNo=2201&TabID=1&C=SEO&U=SEOsearchPages&doy=search

Only problem is they selling 10K, but no 20K. Next one after 10K is 50K resistor :( .

In http://www.vr-zone.com/?i=3027 say's that 10K resistor must be used for GPU core vmod and 20K for VDD/Memory vmod. So, if i can't get 20K resistor, can i use 10K or 50K one for VDD/Memory vmod?
 
It'd be safer to go with the 50K incase the required resistance is higher than 10K. The 50K would just be more sensitive to adjust to the required resistance.
 
OK i see...

Cheerz mate.

P.S. Now i understend... In 50K case, when you decreasing resistance, will be point when resistance is 20K, anyway:p . But in 10K case you can't go higher then 10K. I knew answer all the time, but was too lazy to think about it :D .

Sometimes help's just logical thinking!!!
 
You could always have two 10K's in series :D

Have you soldered small components before?

What are your plans, and what cooling are you using?
 
stocky said:
You could always have two 10K's in series :D

Have you soldered small components before?

What are your plans, and what cooling are you using?
Click to expand...

Yes, i have quite good experience with soldering.

At the moment on stock air :D. I just want to see how things will go, i never done any volt mod's so it's time to get some experience in this field as well :B.

I did order multimeter, soldering iron and resistors today, hopefully till week end i'll be able to do some vmod.

OK i got my multimeter, soldering iron and resistors today:smile2: .

But... now i'm struggle how to use multimeter???:dumb:

In http://www.vr-zone.com/?i=3027 i can see 2 points for voltage measuring (i located them on my card as well), so my questions is:

1) what is correct seting on multimeter to measure voltage? (i'm using UNI-T UT58C multimeter: http://www.uni-trend.com/UT58C.html)

2) do i need to use both test leeds (black and red). One for this point on card and another for ground or something?

3) do i need measure voltage when PC is running?

4) is there any monitoring utility around for nVidia's cards, so i could see any volt change in Windows?

Sorry if questions sound stupid for some of you guy's, but i just want make sure i'm doing everything correct.

Beter i ask for some advice then do it on blind and fry my card :D.

Cheerz!
 
1) - 2V/ 20V, whichever reads the voltage. (2V should work)

2) - The red is for the test point, the black goes to a ground point. Your cards mounting bracket and case will be linked to ground.

3) - Yes, or there won't be anything there. Go into the BIOS screen when measuring and adjusting the voltage. Remember that the core voltage will jump higher when 3D is activated. (around +0.2V)

4) - Just use the multimeter, as it's the only reliable thing.

Be careful, good luck - and don't prod the wrong things! :)
 
Wonder!!!

Cheers stocky!

But new day new wonder...

I did as you said mate... I wnated to find out what is voltage of Memory, so, red leed on test point, black on ground (tried different parts of PC), 20V setting on multimeter and i got reading -0.00V. When i took away ground leed it's jumped up to 0.61V (only red leed touching point, black leed not used), then i took ground leed and pressed metalic end of leed between my fingers, now reading was 1.97V :O . I checked this thread http://www.extremeprometeia.com/forum/showthread.php?t=4957 where said that memory voltage for 7800GT is 2.08V. Then i assume that my bigest reading 1.97V could be correct for my 6800 GS 8). But i can't understand why i got this reading only holding grond leed between my fingers (using my self as one big ground :D ), when it should work with some ground part from PC. The same story with GPU voltage, readings -0.00V, 0.30V and 2.28V.

Is my multimeter faulty? I cheked my resistors and i got readings 9.6K for 10K resistor and 48K for 50K resistor which is fine, i think?

Anyway, all i want to know is this 2 readings could be correct for 6800 GS (even if i'm using my self as a ground): 1.97V for VDD/Memory and 2.28V for GPU? In a case if readings is correct i could keep using my self as a ground and do vmod.

P.S. All readings when idle.

CHEERZ!!!
 
Weird! :?

I usually use an autoranging calibrated Fluke DVM, so I don't have to worry about my readings being out :B, I can only suggest that you try the 2V option on the multimeter. It could be showing the -0.00v, because it's out of range on the 20V setting.

Report back when you've tried the 2V setting ;)
 
Same story with setting on 2V :@ .

But how do u think is readings i posted before could be correct (when using myself as ground)? What is the stock voltage for 6800 GS anyway?

EDIT::oops2: O man, what a shame :redface:... I was using wrong settings on my multimeter, instead of 20V DC i was using 20V AC :whistle: . That's why my multimeter was acting so awkward.

All i can say is ->:dumb:

Now readings is:

GPU 1.23V

VDD 2.06V

Thanks for your help stocky, much appreciate :bighug:

P.S. Later i'll let you know obout my vmod.
 
Last night i was experimenting with vmod and i got picture like this:

520MHz/1300MHz

GPU 1.40V (1.23V stock)

VDD 2.12V (2.06V stock)

I ran 3DMark05 (game test only), test was stable and i got score 6292, but temperature was too high: 86C comparing to 69C with stock settings. After i playd Battlefield 2 for about 15 min and i could see thah game becoming unstable, temperature was 74C.

As i'm still with stock cooler i think i could change termal paste, as all you now somtimes it helps quite a lot. I hava Arctic Silver 5 thermal compound left from my CPU installation, could i use it on my graphic card as well???

And what would be max temperature i should allow my card to heat up??? I mean safe temperature with stock cooler?
 
Yes, AS5 is good for graphics cards :)

They usualy have a temperature where the card will shutdown (thermal shutdown) to protect it from damage. I don't like my cards to get over 70'C on air, as higher temperatures do shorten the life of the card...
 
Paranoid!!!

Today i dismantled my card and changed original termal compound to Arctic Silver 5 (GPU & RAM). After i ran 3DMark05, but i had a strange problem. My PC kept restarting at begining of test 2 (Firefly Forest). :?

After i played BF2 for at least 30 min and everything looked fine. Then i ran 3DMark03, test was successful. Then i ran 3DMark06, but there was the same problem as with Mark05, at the begining of test 2 (Firefly Forest) my PC restarted again.

Do you have any idea what could cause this strange behaviour of my PC?

I'm just geting paranoid, mybe i did something to my graphic card while i was changing termal compound... OK it's not 7800 GTX or 7900 GTX, but anyway if i messed up it's mean i flashed down 150 £ in toilet :( .

EDIT: I found out what was wrong, it's sorted now :) .
 
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