With XFR you probably won't even need to overclock the cpu. It works so well that it's almost a waste having all cores on 4.2.
But then again this is OVERCLOCKERS.co.uk![]()
I built my dad a 2600 system recently - no real "overclocking" couple of tweaks in the BIOS it seems to be boosting to 4.1GHz (well 409XMHz) of its own accord and no instability. I'm not going to mess about properly overclocking his system though to see what the processor will do.