I set them in the BIOS (CL, tRCD, tRP, and tRAS) to 4-4-4-12, but Memset now shows 4-3-3-9, so it's only detecting a change to CL (and I think 3 and 9 are the lowest settings possible in the BIOS for those three). What might cause this?

RCG_Bex: We're in the same boat regarding instability. I get random crashing when the computer's sitting still for no apparent reason, and I was getting rebooting when the OS started for a while (though not any more). I'm running pretty low on ideas, myself. I take it you have no problems running Prime95 or MemTest86+? I also recommend double checking SATA stuff, since that is one definite cause of reboots for this board.