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Up to yesterday I had a Geforce GTS 512. Infrequently, it would hardlock my machine--black screen, looping sound, the works. Usually while playing something high stress (Dragon Age), but not always (WoW).
Yesterday, thinking that since it only happens when the video card is under stress it must needs replacing, I got a new video card with my work bonus. An XFX Radeon HD 4890, to be specific.
Well, it does it worse--probably 30 minutes into a game, or 3 minutes into a GPU burn stress test (OCCT v3, specifically), it dies. GPU-Z shows the temperature at between 85 and 90C at the time of the crash, though it sometimes crashes far lower (73C during Dragon Age, for example).
So this led me to think, could running the video card be causing some OTHER component of my system to overheat? Some piece of the motherboard, perhaps? Or did I really get two videocards in a row with cooling issues?
Case: Antec P180
PSU : OCZ 700W (forget the model, sorry)
CPU: Q6600 (clocked at default of 266MHz FSB * 9 = 2.4 GHz)
Memory: 2x2GB+2x1GB Corsair DDR2-6400 (800MHz, underclocked at 2x266MHz FSB = 533MHz)
Video: see above
No overclock or voltage settings besides underclocked RAM (I checked, it had no impact)