Computer unstable after 8800GT volt mod

[I M Zero]

Yesterday I had to just try overclock my 8800GT card when I reached the border. So I thought if I could modify volts as I have seen others do it. I found a guide on the web and began to rush into it. I put the voltage of 1.10 out NiBiTor that came with the package in the link and then flash card. It works fine for normal use, but then I would get it up on the 700 core and 999 memory or so, giving both ATITool artifacts and sometimes freezes my computer too full and I need to take power.

Is there anyone who knows about my problem or what mistakes I have committed? Could it be a power supply of poor quality?

Specs:

ABIT Fatal1ty FP-IN9 SLI
Core 2 Duo E4600 2 MB
Geil Black Dragon 2 x 2 GB
3312BLA NorthQ Giant UFO
750 W power supply (Can not remember the brand, do not think this is something known)
Inno3D 8800GT

[SUpER CoP]

If your comp freezes, so there you go too fast! Possibly the card gets too hot!

My advice is that you increase it only a few MHz at a time and test the minimum 10min each time to get the card up in temperature.

[I M Zero]

I am 100% sure that it is not due to heat, the Everest and Rivatuner both says that it only comes up to 55-56 during the ATITool artifact scan.

It is with that other cards are better. Is it because I got a bad chip of the card, not clock as high or is it because it is an older version of the chip. As in the example processor e8400 E0

[SUpER CoP]

Take any cooler and see what ram is getting on your card so you can get a better idea of what they can do in MHz and how much power you have to give them.