I upgraded from a 9800gx2 to a gtx 580 the other day, and since then, several seconds after loading a game, the screen will crash to black and require a reboot. Looking at dumps and such, I have traced the problem to a tdr error with the driver nvlddmkm.sys. I've tried everything I could possibly find on the internet to no avail. Tried older drivers, disabling nvidia sound drivers and a bunch of other things. One of the odd things about this is that I can run furmark seemingly indefinitely (max I've run it for is 25 mins), but 3dmark06 causes the crash instantly. Any thoughts? The only thing I can possibly think of would be a failing psu (mine's a 1000w that's about 2.5ish years old, but was plugged in when my old mobo actually caught on fire a few months ago. According to intel's monitoring software, the rail outputs on the 3.3v, 5v, and 12v rails are 3.27v, 5.04v, and 12.65v respectively), but that doesn't explain why furmark can run. Any thoughts?