Looking to finally add some memory to my 15" powerbook G4 1.67 to hopefully squeeze another year of life into my powerbook before I fork out for a MBP. Everywhere I look, including apple, the specs given for my machine is PC2700. When I look at the current module in my powerbook it is reading as follows: Speed: PC2-4200S-444 Can someone tell me if this is correct and I should be get the 4200 and not the 2700? I bought this powerbook years ago used, so I don't know if someone replaced the memory incorrectly? I'm looking to max out with 2 2gb sticks so i will be taking out the old module. thanks for any info.