[davec]

With the prolifera of info and people trying stuff I'd thought I'd drop a little info:

Try not to exceed 20% of default speed. Engineering always under rates by 20% to be sure the unit lasts... nearing or going beyond 20% of nominal values may work fine for a while but could shorten the life of your gear, and you lose your warranty if they find out the unit was damaged because of over-clocking. Just because you can do something doesn't mean you necessarily should...