Core i7 overclocked to 4.2GHz easily
 

Because Core i7 Extreme have multiplier unlocked, so overclockers can easily OC to 4.2GHz by pull up the multiplier. But like Phenom, the bus speed can not boost a lot. So we’d better drop our thought, they are not Core 2 anymore, so we may not have chance to see 500MHz+ bus speed.

http://en.expreview.com/2008/10/11/c...hz-easily.html