Hi all. I came across this place after googling my latest problem I really hope someone here will be able to diagnos my problem. To get a couple things out of the way: I have already run MemTest86 to 12 passes, no errors found. I have run chkdsk twice in a row with no errors found. I've checked the seating and connections of the RAM. CPU runs at about 48*C under load, around 36*C idle. GPUs are also well within temp range (maxing at about 60*C under load). There are 2 cards in SLI, but the BSODs happen in SLI, and running each card on it's own. Okay, now that that is taken care of, the BSODs I've been getting happen exclusively when playing a 3D game, or running 3DMark05 or Aquamark3. Going by the stop codes, I can't find any real pattern myself, but I'm certainly no expert. The machine is about 2 weeks old and the problems have happened since I put it together. A fresh install of Windows XP seems to have cut the frequency of the BSODs quite a bit, but they still happen. Most BSODs have pointed to nv4_disp.dll as the culprit (makes sense I guess), although the most recent one was kmixer.sys or something like that and quite a few have been PAGE_IN_NONPAGE_FILE_AREA errors. I've tried multiple drivers for the video cards including WHQL drivers and beta drivers with little or any difference. I've tried using Driver Cleaner 3 also with no benefit. Any help is greatly appreciated as tech support from the VGA card maker and RAM maker have yielded no improvements in my situation. Thanks to any and all that take the time to help. If you need any more info, just let me know. I'm including all minidumps I have.