Ive seen a couple reviews where someone got a Q6600 when the P5k first came out get to 3.8ghz on air... I bookmarked it, and kept it so I can follow a similar method. You probably wont get this high, but who knows, this review shows it IS possible.. http://www.xtremesystems.org/forums/...d.php?t=144199
Its about 3/4 of the way down the page, trust me it'll save some searching
Also: I did a closer look at the article, it says something about Corsair Hydrocool 200EX 1/4" OD tubing. So I guess he does use watercooling, but definitely nothing like what someone here would use: we'd go much larger on the tubing than that.