They won't overclock any better than the XP2100's... in fact you'd be hard pressed to find something that overclocks that well... if you're going to get a new CPU, I'd go with XP2500's... almost guaranteed 2.2 Ghz, plus you get extra cache which increases performance even more... but honestly, a 2.4 ghz T-bred is probably faster than a 2.2 Ghz Barton. So either get XP2500's, or stick with that you got.