Multiplier might be hard as I'm using a 920..

At first I tried exactly that, just tweaking vcore, vnb and vram, but that rendered the system unstable at everything above 3GHz..
If I lover the vcore just one notch the system crashes all the way down to 3.1GHz..

I will try to bump the NB and HT doown to a minimum and see how high I can get the CPU again.. Last time I got stuck at around 3.3GHz, though, even worse then the current setup.