I'm back again (posted a few pages ago about stability issues on my P5B Deluxe + E6400 OC)

Well, it's still happening and I've been running at STOCK SPEEDS for a week. I woke up this morning to a BSOD. All stock (266mhz fsb, all voltages defined, but set to their default values, except for the memory since it won't POST unless I go up near 2.25v)

What's really frustrating is that I've got 2 sticks of Crucial Ballistix ram, and after my BSOD, the pc will not even POST if I have both sticks installed (this happens sometimes, but not everytime I BSOD). The RAM tests fine, but I haven't run it for more than 1-2 complete tests in memtest. The big thing is that I've even had the RAM RMA'd once before.

Should I just try new RAM? Switch brands completely? Is there a known "good" pairing for RAM and this mobo? Will I always need to keep the RAM voltage bumped to 2.25v, or is that a feature of my Crucial ram?