🙂 Don't know the HSF or mobo off hand, but you don't need to unlock AthlonXP CPUs to o/c them, esp since the XP core makes it harder and riskier than ever. The best and easiest way to o/c the AthlonXP CPUs (certainly below XP2400+) is to simply raise the FSB, that's as easy as a few key presses in the BIOS! XP1800+ or XP1900+ are wise choices, they don't cost a whole lot, give great perf stock and tend to o/c to give XP2100+ to XP2200+ perf!