EVA, 3.9GHz @ 1.344v seems a bit too high for a D0. I've seen most of them getting 4GHz+ on about 1.25v. Have you tried lowering that voltage?

I got 4GHz (20x200) on my C0 at 1.3750v (BIOS) and 1.344v (CPU-Z idle). That was with HT off.