I have an A8N-Deluxe with a one year old clawhammer 4000+. Problem is I can't raise the voltage any higher than 1.5625 without locking up. I even ran everything on stock and bump the voltage to 1.575 and it still locked up. I don't think the proc is the problem because people can even go up to 1.7vcore with those old 130nm. So I don't if its the BIOS or just my chip.