Dont waist you money on a 940 when the 920 is the same thing as the other 2 cpus 940 and 965 just with 1 lower multi??
You dont even really have to overclock at all just set bios to turbo this has nothing really to do with overclocking but will basicly trick your cpu into unlocking a extra multi and run your system at the same specs as the 965 Extreme all without overclocking..
You dont have to touch fsb,multi's,or voltages bios will auto set to the new highest unlocked multi and wammo your $300 cpu is really a $1200 cpu..
I would do it this way if you dont want to overclock or go into buying a new heatsink as running this way will still keep your cpu cool but give you that extra little bit of umph your wanting..