I got my 2600+ up to 2.3ghz w/ no problems. You might be able to go higher but try not to oc your ram as much cause it will make it unstable. BTW dont forget about your vcore voltage.
If I helped you, give a thanks! ↓
I'll send you $30 if they don't release a PC version (GTA 5) within 12months of console release. You can totally hold me to that.
Write it down or copy it into your sig. -Kmanx to PP 11/7/2012