In my case I've been running memtest all weekend unsuccessfully. After disabling XMP in the BIOS it passed. Then I manually lowered my 3000MHz RAM to 2800 MHz and it passed with all four sticks in. I am now leaving my system on to see if it will freeze. So far it's been sitting idle for about 14 hours without a freeze. Fingers crossed it was a RAM issue dealing with voltage since I have an overclocked processor.