At 1/1 CPU and memory, we settled on a final OC of 270FSB. We did manage 275FSB, but even at 3.0v, the system was not stable. Actually, the system was fairly stable at 271FSB at 3.0v, but occasionally we locked up. 270FSB was rock solid, and we were able to drop our voltage back to a safer 2.8v. Keep in mind that this all voids any warranty, but nothing like living on the edge, eh?