I would try tRFC to 58 & NB voltage to 1.30v
Thanks for that. I'm at 400 FSB on an Asus P5Q Deluxe with the NB Voltage currently set to AUTO in the bios. Asus Probe doesn't display NB Voltage for this motherboard. I think the motherboard may automatically increase the NB voltage as I raise the FSB? What do you think the current NB voltage might be with the FSB at 400?