GeForce 8800GTX voltmod log Part 2

In Part 1 of the GeForce 8800GTX voltmod log Part 1 I showed you the tools used to do voltmods and the completed voltage read points on the card. Now I will continue with the vGPU and vMem mods and I have the results from the stock VGA testing with the CPU overclocked with LN2 and the 8800GTX overclocked using the stock cooler.

Now before I continue, it’s disclaimer time again.This article is not intended to be a volt modding guide but rather a log of my progress while doing the mods to the 8800GTX. If you do plan to give volt modding a go, you need to understand that performing these voltmods will void any and all warranties of your video card. You – and only you – are responsible for any damage caused indirectly (or directly) by any modifications made.

My number 1 rule when it comes to doing voltmods, is before I do any mods (other than read points) a full set of air OC benchmarks need to be done and after last weekends OC Workshop, I did just that.

Using the MSI BigBang XPower, an Intel i7 975 cooled with LN2 and the ASUS 8800GTX (only cooled by the stock cooler with the fan set to 100%) I was able to get 648mhz on the core, a small increase up from 576, 1053mhz up from 900 on the memory and 1674mhz up from 1350 for the shader clock. Not a bad overclock but not fantastic. Check out the screen shots below for the scores.

So lets recap, and have a look at the vGPU and vMem mods.

Here is the completed vGPU mod.

The completed vMem mod.

Here are both the mods and the VR’s (variable resistors)

For both vGPU and vMEM mods I used the same ‘ground’ connection, used art eraser to hold the mod wires in place and for the mod wire I used an old IDE ribbon cable.

When doing a voltmod, remember that Ground will always be on one of the outside legs of the VR and MAKE SURE that the VR is set to its MAX resistance before you plug the card in to test.

Best practice I find, is to test the resistance before and after you do the mod. The reading after you have added will always be a little less than before the mod but should never be more than a few ohms less for example the vGPU mod point on this card before the mod read 33 Ohms and after 30 Ohms. Thus allowing you to increase the voltage after lowering the resistance

In the next and last part of this 8800GTX voltmod log, I will get the card stripped free of the stock cooler and prepared to be benched with DICE

Thanks for reading…

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