Leadtek 6600 GT TDH AGP woes

ok so it goes a little somethin like this

I recently bought a 6600 GT TDH AGP from Leadtek
i installed it no problems and updated drivers to latest
installed directX 9.0c
played a game and 20 minutes into it it froze, I thought it was normal so i restarted and tried again and 20 minutes into the game it froze again!
i checked the temps they were all normal 36-39C when idle and 65-69C when loaded so it wasnt overheating
i restarted it and went up to get some food and when i came down i found out the computer had frozen on the 3D text screensaver!!!:@
i went to every forum on Earth and tried most of the solutions like switching off Fast Write, reinstalling drivers, connecting the card to it's own power line, setting AGP aperture size to 256mB, Enabling PCI Delay transaction.
All that didn't do sh1t!!! My games still freeze randomly sometimes 20 minutes sometimes 5 sometimes it doesnt even!!!! it's pissing me off!!

yes everything is plugged in and the card is seated properly and i set the fan to constant 100% fan speed. It hasnt been overclocked
oh and my computer specs are

AMD64 3000+
1 gig RAM
Asus K8V-X
Audigy 2 in bottom PCI slot
Leadtek 6600 GT TDH AGP with Dual monitor
200GB IDE HDD
500W PSU with detachable power lines (3D card is on it's own dedicated line)

I hope it's not a faulty chipset
oh and it doesnt freeze when on the desktop, it hasnt frozen on me in 3D Mark 2005 either, although it's been stressed beyond belief haha (down to 1 FPS)

Those load temps sound a little high. I have the same card in another comp and I was playing around with some lesser heatsinks after I took it off water cooling because I couldnt find the original one - around 70C I was getting lockups with the other heatsinks at stocks. I suggest removing the heatsink - cleaning the gpu off with some rubbing alcohol and putting a thin coat of new thermal paste on it (pref AS5) If that doesn't work. Try it in another system if possible or RMA the card if still under warranty. If it isnt heat it sounds mostly like hardware. Also try the latest drivers and also check mvktech.net for new firmware.