Trying to get q6600 to 3.4ghz

[aVaLaNcHe]

Like the title says, I'm trying to push the processor to 3.4GHz and get closer to 17,500 on 3dmark06 (currently 16,900). I have it currently at 3.2GHz and the vcore is at 1.34V.
However I tried bumping it up to FSB 378 and bumping vcore up to 1.35, but the mobo won't post. I dropped it back down for now, but this frustrates me that it won't go higher. Temps are fine at 3.2, running at about 40*C on air (43 at load).

Here are the specs:

Q6600 at 3.2GHz (1.34V)
XFX 680i LT SLI Mobo
4x1GB Corsair PC 6400 800MHz 5-5-5-15
SLIed EVGA 8800GT 512MB GDDR3 700/2000/1750

Any ideas?

[Sunny]

Maybe your mobo cannot handle that high FSB speeds. Or maybe the processor. Since all chips don't always overclock the same.

[-RK]

First off take your memory clock down by increments and try it then. If that doesn't work, try raising CAS to 6 and SLOWLY bump up ram voltage.

You should be able to get it up to 3.3 at least.

Also, have you tried taking the vcore a little higher without the clock? That would help pinpoint the problem.