Hey! I have recently over-clocked my E8400 to 4.2Ghz on air. Pretty simple, you go into your Bios under jumper free configuration, from there you select the manual O.C. settings(instead of A.I. NOS), set the FSB to 466mhz and the CPU V core to 1.4250v. I succeeded with the Thermaltake Max Orb, pretty simple cooler but works great after all... and I have a p5k deluxe motherboard, nothing high end but I get the results I want, you should try it out!