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How-To: Gainward 7600GS PCI-e Voltage Mod - Voltage Mod (Wrap up)
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Written by phatic   
Friday, 01 September 2006 18:43
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How-To: Gainward 7600GS PCI-e Voltage Mod
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Voltage Mod (Cont.)
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Once it's done, it should look something like this.

Image
(Click for larger image)
 

Now, with the potentiometers set to full resistance, measure the resistance between the two pins you are using. The resistances should be fairly close to those stock values (1.29k ohms for memory and 1.39k ohms for GPU), or most likely a little lower. To predict the new voltages before powering up, use this formula:

v(new) = v(stock) x [ r(stock) / r(new) ]

So, for example, if your new resistance for GPU core is 1.3k ohms, 1.15 x (1.39 / 1.3) = 1.23v.

Now a final few words of advice. Take things slowly, increasing the voltages one at a time. I'd suggest taking the core as far as it will go first. Once the high temps induce artifacting, knock back the voltage a little, so that the load temp drops a few degrees. rthdribl or ATITool's artifact tester will put your GPU under max load, and find the top temp it will reach.

You may have to knock back the memory clock speeds a bit once the core clocks get really high. I had to drop the memory from 470Mhz back to 450Mhz once the core went over 600Mhz, otherwise it artifacted very badly. This was a fair trade-off, since the max core speed reached was 750Mhz.

Also, the Memory is rated up to 2.3v maximum - anything over this may cause permanent damage, so stay below this. The memory on mine became less stable above 2.15v anyway, so this is fine.



 
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