OK, I push the limit a bit further, now I am at 425 x 9.5 = 4038 MHz @ 1.35v, DDR3 1700 @ 9-9-9-28 1T 1.8v. Still testing now, but at least GRID seem stable. I will test with my c0cktail test (3Dmark06 + Orthos + BitTorrent) tonight.

If it is stable then I will be satisfied for now, breaking into 4GHz is always my goal with this new build.