Well I am running my FSB at 2.5GHz which calculating puts me in the 4750+ range give or take I think
Run Central Brain Identifier and it'll tell you what your CPU is equivelant to, meaning 4000+ or whatever
You need to loosen your RAM's timings. Of course you aren't going to go very far keeping it at stock timings.
2.8-2.9v for RAM is fine, try your timings at 2.5-3-3-7 and I'm sure it'll go further....hitting upwards of 2.9v I'd put a fan blowing on the RAM though
CPU voltages are really low, if you want to go further keep pushing the vcore....I wouldn't go beyond 1.65v your first time through