Yeah it is at 400mhz. But I had a 2.0ghz celeron, that was running at 3.1ghz stable(fsb660mhz). And when I got my 2.4 p4 533, all benchies except sandra cpu/arith shot up by 20-30% before I even oced the p4. The Celeron wasn't even a contender with the huge clock, fsb, advantage.