9800GTX voltmod thread

[largon]

That's exactly like the pic. The other point doesn't have to be the screw, red dot to any ground will do.

[n3wbi3]

That's exactly like the pic. The other point doesn't have to be the screw, red dot to any ground will do.

Cheers mate .... Also can u be so kind to piont out the read piont to me plz.....

[largon]

Easy vGPU measurement points can be found in the pic in post #15. There's 2 rows of surface mount ceramic caps behind the GPU. Each cap has two tin ends of which one is a vGPU measuring point (the other being ground).

[Xargo]

Would someone be kind enough to measure resistance from the marked pads to ground on this pic:

A: 659Ω
B: 7.5kΩ
C: 620Ω

[largon]

Suur-kiitos Xargo:lle!

[hwaChris]

I have now 3x GeForce 9800 GTX (Thanks to Gainward!!)
Going to voltmod all of them to cool with Dice.

I run already some 3-way SLI benchmarks on Stockcooling without Voltmod:
http://www.hwbot.org/result.do?resultId=724049

525Ω Poti -> 13,0Ω total -> 1,24 Volt

[Spacemaster]

Ok I am blind, can some one post pic with two spots for VGPU measurement, just two spots. Thanks in advance.

[jason4207]

From post 15:



One side of each of those SMC's is GND, and the other side is vGPU.

[Spacemaster]

Thanks
So how much voltage is safe at stock air ?

[hwaChris]

Grab the voltage on a vertical resistor.
Some horizontal resitors do not have Voltage on system boot e.g.

I'm running 1,35V on air with 2x 80mm-Fans.
Mount a vacuum cleaner at the back and you get better Temps approx. -5 to -10 degree Celsius less.
Or put the Stockfan to 100% with RivaTuner: 1,35V no problem.

[skorpio2x]

Going thru the threads or volt modding.. does anyone have a volt mod for the memory yet? inc. guide w/pics?
thanks in advance!

[largon]

Anyone happen to bump into a practical vDDQ (~2.00v) measuring point?
The Delta inductor on the frontside is a bit inconvenient... I can't find one because I don't have the card but I need the point for making the vDDQ mod guide.

[nflesher87]

bump to keep this thread up, I'm going to try this out next week

[hwaChris]

Shamino told me that there is a VMem-Mod somewhere at VR-Zone, but I did not found it until now.

[jackies]

So anyone can tell what was the final resistance for 1.35-1.38v?
Just got me this card, got to wait till mcw60 comes back in stock on newegg..
ETA 4/30

Any progress on vmem?

[skorpio2x]

thanks for the mod!
running 870/1200/2000 on stock fanspeed 100%mod
17,600 3dmark06 on q6600@3.8ghz

should have my ek waterblock in 2-3days!
il let you guys know when i hit 1ghz stable

**not scared!**

[n3wbi3]

wen i connect the 500ohm resistor does the screw start from the left position so i turn it clockwise to increase voltage or does the screw start from the middle postion, turn clock wise to increae and anti clock wise to decrease the voltage.




I hope that makes sense guys.

Am so noob never done this kinda mod b4, just want to be clear dont want to kill anything.

[tuchan]

On the pots I use, clockwise is increase voltage (lower resistance).

[xie67]

Time to break out the multimeter mate..

[largon]

Never-ever volt mod if you don't have a multimeter.

[skorpio2x]

so hows about this vmem mod?

[largon]

Sorry, seems I forgot to post memory vDD and vDDQ mods!
Caution, these mods are untested.

Here's vDD (= vMEM):


And vDDQ (= "the other vMEM"):


Measuring points:


PS. I know there are easier vDD (dunno about vDDQ?) measuring points on the backside but it's summer and I'm too lazy to draw the diagram.

[jackies]

Kyllд!
Is it summer already?
Anyway, great job, let's see someone getting results with this... I'm still waiting for my waterblock.
Question: how do we adjust vDDQ? Just bump it about 0.1v and see what happens?

[fafoylis]

vcore is 500kΩ?

[largon]

jackies,
0.1V vDDQ increase should be safe and give a clue if adjusting it yields something.


fafoylis,
500Ω VR, not 500kΩ. The solder points should measure ~11Ω beofre soldering.