AMD Athlon XP 2500+
A lot like this Athlon XP 2500+ but about a year older. I picked up this CPU cheap and because it's a year older it has two differences:
1. Different PCB substrate. The older versions have a smooth surface (with modifiable traces).
2. It has been made in the 6th week of 2003. I've had a couple of Athlon XP's from that time-period that overclocked very well (not to imply that newer ones don't- some of them clock very well too) so I want to test if this one is very capable too.