random CRASH/BSOD after loading game/section

[QUINTIX256]

For entertainment, i'm running memtest86 as we speak. It has not come up with anything, and I doubt it will. This is a new computer that I built.
It probably was best to leave my answer at "everything is running at stock clocks" instead of going after this red herring.

Also, every now and again I go in to verify the game integrity through steam, and it finds 15 files it needs to redownload. Removing local content and redownloading all 3 penumbra games does not seem to prevent this from happening.