Hey, wanted to inform you guys that I found the real problem. It wasn't that it was overheated or that the memory failed, it turns out that Dell installed my memory cards in reverse after it was returned from repairs. DIMM1 was in Slot 2 and DIMM2 was in Slot 1. It only became a problem after I tried flashing the BIOS which corrupted it somehow, I have no idea why the reversed cards would cause that. When I reverted the position of the two memory cards, it crashed a couple times but did NOT show the memory integrity errors, so after re-flashing the BIOS, it hasn't crashed since!