I'm not familiar with many of the tech sites out there but Anandtech oc'ed an i7

[blake30ver]

http://www.anandtech.com/weblog/showpost.aspx?i=521

4Ghz? holy moley! Granted im an AMD user who isn't used to Intel's OC abilities
edit: on water cooling. didn't notice that at first. Somewhat impressive, but less than the initial impression .

 

[Brolloks]

That is a modest OC, these i7's have a lot more in them with the right cooling, for 24/7 on air or water 4-4.2 is about as much as you will get from them.

 

[White_Pawn]

the 920i is limited more so than the 940i or 965. Max base clock is going to be around 200~220 for the 920i and the 940i.