4641 Mhz CPU clock is good, but that is merely the 'boot into windows' clock, no load or stress testing. And of course we don't know what cooling was used...dry ice, LN2, phase? My C0 920 passes 1M superpi at 4662 CPU clock at just 1.484v Vcore, 4 cores, HT off, all on a Tuniq tower 120 air cooler.