that is different because 45nm processors were designed to work at 63%...now, that might be for the Wolfdale and the Yorkie could be different, or higher!

looks like my Yorkie, QX9650, working at 63% GTL REF, is limited to 480 FSB to function within windows...Prime 95 is going on right now at 63% GTL REF...doing nicely after 30 minutes...at 490 FSB (same multi, 8x) it would freeze or drop 1 or 2 cores out after 5 minutes.