Frying 7900GT boards

[t024484]

When my first 7900GT board started to behaving strangly, I thought it had to do with all the experiments and changes I had made to the board.

I bought a second 7900GT board, and modified it to 1.5 Volt GPU and 2.14 Volt Mem and added a Zalman VF 700.
GPU temp was never higher than 62 C, and everything worked fine for two whole weeks until yesterday. As a first sign, the board started dispaying huge artefacts in "Deep Freeze", the last test of 3Dmark06. After that happened, I had to restart the system to get the display working again. 3Dmark05 still worked troublefree at that time.
At the end of the day, ever more problems ocurred, and now I cannot even run 3Dmark05 anymore.

It seems to me that the G70 GPU is not able to have 1.5 Volt on its pins permanently as well in the 2D as in the 3D mode.
With 1.5Volt it seems to be an accident waiting to happen.

With my experience based on two boards, I can only advice: Do not apply more than 1.4Volt on the GPU, or even better have a board that only has a higher GPU voltage when in 3D mode, like the EVGA SS serie.

The 7900 GPU is nowhere as robust as the 7800 GPU, since I never had the slightest problem with the last.

I am considering now to buy a 9750, mod nothing at all and return it under RMA if anything goes wrong. All I need is the right BIOS for my P5WD2-E.