*SOLVED* 4870X2 Lockups/BSOD First of all I'll go through my PC specs in more depth than the panel on the left. Intel Core2 Duo E8400 @3Ghz CPU 2x 2GB DDR2 Apacer RAM Sapphire 4870X2 GPU Silverstone Zeus 850W 70A Quad +12 PSU Nvidia SLI ready 3 WD SATA HDD Asus P5K/EPU w/ Intel P35 chipset MOBO 1 Acer P243W A Monitor through DVI Windows Vista X64 Ultimate SP1 Catalyst Control Center 9.1 Up to date chipset and monitor drivers All games are patched up to date BIOS ver. 0604 I'm getting seemingly random lockups and BSODs when playing 3d games (such as crysis, oblivion, FSX, Gears of War, and PSX emulation) but not while benchmarking and stress testing (rthdribl). The crashes seem to be less frequent if I turn off the second GPU, but this may just be coincidence. The PSU seems to be SLI ready, but does not say anything about crossfire, but the 4870X2 is on one PCIe X16 slot, would this be the issue? I'll go ahead and list some of the things I've tried. -Re-seating the GPU -Turning CCC AI off/Standard/Advanced -Overclocking/Underclocking GPU core/Memory speeds -Overclocking/Underclocking CPU speeds -Different operating systems (Win7X32) -CCC 8.10,8.12 -Backdated chipset drivers -Ran OCCT, cpu came back stable -Ran memtest86+ ram came back with no errors -increased and decreased nb, cpu, ram voltages Now a more detailed description of the issues. I'm getting lockups in-game in Oblivion and before gameplay begins in Gears of War. Crysis seems to be a little more random with crashes in either the menu or in game, pixilation and graphical distortion in game, BSOD in game and on exit resolution change. I seem to get a lot of crashes when changing resolutions, usually when exiting games or changing resolutions in options menus. Strangely enough I cannot seem to get a crash at all when stress testing with rthdribl and the GPU seems to perform extremely well during these tests. The crashes seem to be a lot less frequent when using a lower resolution monitor through VGA instead of a much larger 1900X1200 monitor through DVI. I've contacted AMD/ATI support and they suggested an RMI, but sapphire only allows an RMI through the sales outlet (which is a local computer store). I brought the computer into the store, told them the issues and they couldn't find anything wrong while benchmarking for 12+ hours with 3Dmark so they sent it back to me. The problems persisted and I brought it in again with my games, they played them, got some crashes, then said they updated the GPU drivers and it magically started working again (I'm 100% sure I had those updated to latest drivers). They seem to be either lazy or stupid, so it seems I either need to point them in the right direction with the root cause of the issue, or I need to compile detailed logs of the crashes and print them out for them, I need your help in either case. So can you please point out possible issues or other things to try? Or can you please point me in the direction of some good software I could use to compile crash logs which I can print out? Is my GPU compatible with my PSU? And how can I find out if this is a CPU issue?