I've got the same rounding error in Prime on P5Q-E :/. Windows seems to be stable though. It doesn't react to changing FSB. If i set it to 400 or 475MHz it's the same. Rounding error 0.5 sumtin sumtin. Halp?

Q9300
2x2GB A-DATA 1066+
P5Q-E

fsb: 450MHz
333 strap, 1:1

vcore 1.4
vnb 1.4
vfsb 1.25
ppl 1.60
vmem 2.3
llc on (off doesn't help)