Thx guys!

The C3 doesn't scale beyond 1.55v, so I couldn't get higher with 1.575v or 1.6v.
SKYMTL, the difference is 2W in IDLE... in LOAD is about 15W which is nice.
Yes, I used C1E and Cool&Quiet activated and from what I saw the NB doesn't slow down.
I will put pics with the CPU later today !

Regards,
matose