First thing I do when I encounter a BSOD, is rule out the RAM, as it's often a culprit behind BSODs. Simply download and burn MemTest86+ to a blank disc, restart, and boot from the disc. If it finds no errors, then the BSOD could be due to incorrect memory settings in BIOS. So, be sure you're running your memory *specifically* at their rated specs and correct voltage. But I'm curious as to why you're on 12GB of RAM, when 12GB can only be achieved by installing a 3x4GB triple-channel memory set. When the P67 strictly requires dual-channel memory. Such as 2x2GB / 2x4GB / 4x4GB. Yeah, 3 sticks of RAM is going to run in degraded single-channel mode on your socket 1155 / P67 board. Cosiderable performance hit there. You should remove one stick so it runs in dual-channel like it's supposed to. Triple-channel memory (3 sticks) is only intended for socket 1366 / X58.

Also, are you running the latest 270.61 nVidia drivers for your GTX 560 Ti? If not, then grab them here: http://www.nvidia.com/object/win7-winvis…

EDIT: Ahh ok, 'cause I often see people on here installing 3 sticks of RAM on dual-channel boards, and it's something to facepalm at, so I assumed you were another one. Nah you're good with your RAM configuration then. You mention Corsair Vengeance. Their sets come in 9-9-9-24 2T, or 8-8-8-24 2T, so just be sure they're running at whichever timings they're supposed to. If both sets you bought have different timings, then just make sure you're on the 9-9-9-24 2T timings, and 1.5v. And make sure you're on the latest BIOS for your board. Updating the BIOS on ASUS boards is pretty simply and straightforward. Good luck.

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