I've just ordered one for my P5K Premium. I didn't find anything official, but this guy is running one in his Asus Rampage...
http://www.tomshardware.co.uk/forum/246864-11-xeon-x3360-voltage
I hope it works ok, tell us how it goes![]()
It should work. It's just a Q9550 after all. I had an X3350 (Q9450) running no probs on my Gigabyte X38-DS4 and Abit IX38 Quad.