Koolance CPU 330 block P5B Deluxe Micron D9GKX P4 Celeron 331 @ 5000MHZ 1.6V http://www.teamnexgen.org/forum/hardware-discussion/255-wr-celeron-331-water-cooled-5000mhz.html New WR? Not sure if 5GHZ on a 331 is an overall Record but for water its damn high.
Cool overclock! I can manage to push my Celeron D to a 3.8GHz with stock heatsink with priming average 2 hours. A Celeron D 331 is a 90nm core, as I've owned it before too. You can try overclocking the newer 65nm core, they are much cooler! Maybe I'll get a better cooler to push it up to 4 GHz.