3.8-4.0 might be stretching it on air, if you got a good Q6600 then I'd say you'd be all set to go. I haven't tested the max fsb on my board yet. But compared to my AB9 Quad GT, I can still hit the 9x400 easily and using same voltages I can go up to 430 (quad gt required more voltage) and the quad couldn't handle 8x400 but I am currently running 24/7 8x450. Once I got some bugs with esata and RAID worked out the actual oc is awesome, and Uguru is the 1st in windows program I've used to oc that doesn't get me frustrated.