That's a KT133A chipset right? My guess is that it handles Palomino XPs up to 2100+... Most decent KT133A boards will support that line of XPs. However, all bets are off with the lower voltage TBreds, Applebreds, Thortons, Bartons, etc... Update your BIOS to the latest version. See if there is any revision information on Abit's site.
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