It depends on what memory I'm using. I've been using some CH-based UTT (early Mushkin Blue line) for many months now and at 280x10 with the 180 divider its running at 255MHz 2-2-2-5. BUT... I just got a 1gig set of OCZ PC4800 Platinum Elite (TCCD) and its at 311MHz @ 2.5-4-4-8. I've got some tweaking to do, I'm hoping to get that down to 2.5-3-3.