Overclocking Athlons is an effective, and free way to get more out of your rig. FSB is one part of the equation, and unlocking the multiplier is another part. It isn't that easy to unlock an Athlon XP, but we look at a kit that makes unlocking a snap to do.unlocking kit

There's also other interesting hardware items from the same article here
including an adapter card that lets you connect up an AGP card AND a PCI card into a single PCI slot.

sources The Inquirer & warp2search