Just curious I am fairly certain I will be purchasing a new MBP, and I was wondering if and when I decide to purchase 4gb of ram, would the old sticks work in my Powerbook? Powerbook G4 1.5 (ram - PC2700) vs MBP (ram PC5300) Would it blow up the PB, or would it just automatically lower itself to the slower speed? hopefully I explained myself sufficiently. I am sort of hardware challenged. Thank you.