Gtx 275 Volt Mod

[cowie]

i thuoght i'd repost this with results.
just some air testing for now
could still use a better v-mod point i think...how about you pro's?

it worked for me but try at your own risk

from the nice guy at
hardwareluxx
octacore
http://translate.google.com/translate?js=n&prev=_t&hl=en&ie=UTF-8&u=http%3A%2F%2Fwww.hardwareluxx.de%2Fcommunity%2Fs howpost.php%3Fp%3D11800915%26postcount%3D1&sl=de&tl=en&history_state0=


i used a 100k vr
http://www.abload.de/image.php?img=gtx275_vmodzpfm.jpg

stock volts 1.01v 2d 1.10v 3d
max clocks were 750ish for all 3d
vr set 98K
here i used 1.14-15v 3d
770/1690/1230
x3 rounds of 03's 3d tests in a row
temps look ok
http://img172.imageshack.us/img172/3520/275vm031.jpg (http://img172.imageshack.us/my.php?image=275vm031.jpg)
vr set to 91k
1.20-22v 3d
multi runs np
about .10v added
790/1769/1230
http://img172.imageshack.us/img172/5048/27503122v.jpg (http://img172.imageshack.us/my.php?image=27503122v.jpg)

if i get some time this week i'll test it alittle more and push up the volts

this mod is easy 45-50mgz add on with stock h/s so far

first 06 run
782/1240 on my e8600
http://img25.imageshack.us/img25/5817/27506rt.jpg (http://img25.imageshack.us/my.php?image=27506rt.jpg)

[TheKarmakazi]

Looks good cowie! How many of these things did you get?

[cowie]

hey karma

just one,thuo i do have another 1 coming in the next week.
maybe i'll buy the 3rd? or 3rd 4890? idk till i test 275sli vs 4890cf.

[TheKarmakazi]

u get the 275 ill get the 4890 :D

[Amurtigress]

Hello people,

I just purchased a Gainward GTX275 card with a seemingly custom layout. I took photos of the power controller chip. It is a Richtek RT8841. Unfortunately i am not an expert in analysing the circuitry around the chip but I've done many voltmods in the past using a Weller solder station.

Here's the datasheet of the chip:

http://ceemic.pri.ee/hardware/datasheets/RT8841.pdf

This chip is intended actually to do the regulation for AMD and Intel CPUs, so I wonder if it is possible to overvolt the GTX275 by manipulating the VID pins. This depends on the operation mode certainly.

I only peeked at it briefly, but it also looks like the chip was programmable, and a soft mod could be possible.

[TONY GAL]

my friend with this mod with 100k i have burn 4 cards:( because the default volt is 1,26 yet and the mofset in this card take fire and the end...this mod do it to me like yours my friend hipro5 do it together and 4 cards burn!!!
i dont explain!!::p: