My 24/7 setup is 3.2GHz (400 x 8) with E6600. I have 2GB Corsair PC6400C5 at 4-4-4-12 and a Scythe Ninja Rev B. It is stable as a rock. Just for the sake of standard testing I did a 12hr orthos and it passed. 42C idle (C1E and EIST off) and 62C in Orthos.
Vcore: default (1.35V in uguru)
Vmem: 1.9V
Vmch: 1.65V