I'm pretty certain is it not Video RAM related. Usually, if VRAM is faulty, you would get artifacts before crashing. VRAM issues are "manageable" than Core issues.~v3n0m~ said:yeh, we have to deal with luck when we buying from them. but if its a genuine shop, we shoud be protected with their after sales service.
yes i have seen that driver crashing thing when i was overclocking an Nvidia card i had previously. Completely replaced my RAM sticks. did the mem test. then I did the CPU stress test to verify that the problem is not with the CPU or the RAM. and they tested it with a whole new setup. not only with the crysis, but also with the stress test softwares, it was crashing. it could be a gpu ram related problem?
The problem is, I don't see why the PC would *reboot*. Freezing, dropping to desktop and blank screen are the video card related problems. Rebooting (except for CPU/RAM instabilities) is *software* related I suppose. BSODs! Probably, driver related or game related.
It could well be a heat problem. Some people are reporting heat related issues with HD4870. The temperature isn't bad, around 75-80C, which is no sweat for nVidia cards, but for some reason HD4870 seems to run into trouble with a bit of heat. >_>
Too bad I don't have a solution to your problem. I'm kinda out of loop with the latest hardware, 'cos I had to postpone my next upgrade for an unforeseeable distance.






There are USB ones available if you shop around Unity.