Hi, newbie to this forum

I am running the P5E64WS Evo with a QX9650 and 4G of OCZ Platium DDR3-1600 @ 1333, and a pair of ATI 4850 in CF. Everything auto (including mem voltages). With BIOS 401, everything seems very stable.

Not trying to overclock. But feeling courageous and updated to BIOS 0504, system started to crash randomly, especially during HD/CDROM access, which indicates something with the SB. I had raised NB voltage to 1.41V and mem voltage to 1.7V and still random crashed with BIOS 0504.

Downgraded back to BIOS 401, everything is fine at auto (MCH @ auto, MEM @ auto) again.

What gives?