Both times it has happened while I was doing something unorthodox, first time I was playing fallout and attempted to save while midair, second time I was alt tabbing through programs rather quickly, is this anything I should be concerned about?
I would test your RAM. I have a 16gig machine that only occasionally had bsod but in the end it was the last stick of ram that was failing but i was just not using it often enough to get the bad sectors.