BSOD Mostly When Playing A Game?

Often, when I start up a game, it decides to crash my whole system resulting in a blue screen. Do note, however, that it has also crashed when not in a game, but only once or twice.My first thought was the ram, as it was and is giving a lot of memory errors, so I ran memtest for over 10 hours with no failures. My next thought was the CPU, so I ran prime 95 on blend and small ftt tests for over 8 hours which also proved to be stable. Next was the HDD, and I did everything from examining the SMART info to a long generic test. GPU was my last hope, but Furmark doesn't phase the card, and I even ran MemtestG80 which supposedly tests the GPUs memory as well. I do realize these tests are not the end all, and there could be a problem with any one of them that the tests didn't find. I have also reinstalled Windows Something curious happened when I ran memtest the other day. I had one stick in and left the room for a few minutes, only to come back to 7k+ errors. This was it I thought, I finally found out what was causing it. I wanted to test it again to make sure it wasn't a bug in the software, but it ran for 8 hours with no errors. So I'm lead to believe it's the ram, motherboard, memory cache, or psu. I am leaning away from the psu based on the fact that I get lucky and am able to play Skyrim on Ultra with no issue.I have attached several recent minidumps for anyone who is able to understand such things.