I've just built a brand new computer as follows: Seasonic 650W Platinum power supply Asus P8Z77-V Motherboard Intel i7-3770K Crucial Ballistix Sport DDR3-1600: 4x8GB 2x Intel 520 240GB Gigabyte GeForce GTX 660 Windows 8 Pro I'm not overclocking anything. CPU is running at stock (only "OC" feature turned on is Asus Multi-Core enhancement). Memory is running at 1.53V (bumped up from 1.5V to try to fix the problems) and 9-9-9-24-2T, which is what it is rated for. Fresh install of Windows 8 Pro. I've tried builtin drivers as well as the latest ones from Asus. In the last 1/2 a day, I've had the following crashes/blue screens: BSOD - 0x000000ef CRITICAL_PROCESS_DIED BSOD - 0x0000003b SYSTEM_SERVICE_EXCEPTION BSOD - 0x0000001a MEMORY_MANAGEMENT iexplore.exe APPCRASH with 0xc0000005 waterfox.exe APPCRASH with 0xc0000005 mmc.exe APPCRASH with 0xc0000005 explorer.exe APPCRASH with 0xc0000005 tiworker.exe APPCRASH with 0xc0000374 EDIT: And now I just got a PAGE_FAULT_IN_NONPAGED_AREA BSOD when shutting down to reboot with memtest. The random nature of the problems makes me lean toward memory issues, but I've run HCI memtest, Windows memory diagnostics, and Prime95 with no issues. I'm just getting ready to run memtest86 for a while. Any other ideas?