Tried VCORE at 1.5V and had NB freq set at 2100 (and lower), reduced mem freq to the lowest possible setting, still no good. Also, tried pressing mem OK, but it just goes to windows logo on boot up, and freezes.

Maybe I should up my VDIMM to higher than 1.5-1.6 V? Because I have tried both of those, and they don't fix the BSODs that I get during prime95 tests.

The BSOD during prime95 always says "The system encountered an uncorrectable hardware error."