|PC2-5300 = 667MHz effective memory speed|
PC2-4200 = 533MHz effective memory speed.
Buy the PC2-5300 memory. Your laptop will automatically clock it down to 533MHz.
Yep, the good old Pentium M is a 32-bit CPU, so you're stuck with the 32-bit versions of XP/Vista.
Pentium M oc'ed to 2.82GHz, 667FSB, 2MB L2
3GB of DDR-800 @ 667MHz
Modified PowerMac G4 'Quicksilver' case
HDMI to homebuilt 1080p projector