Hi all... Here is the spec for my ibook: Machine Name: iBook Machine Model: PowerBook4,1 CPU Type: PowerPC 750 (22.15) Number Of CPUs: 1 CPU Speed: 500 MHz L2 Cache (per CPU): 256 KB Memory: 256 MB Bus Speed: 67 MHz Boot ROM Version: 4.2.7f1 I am completley new to changing RAM and would appreciate any help you could give me in choosing the right one. What is the maximum RAM i can upgrade to and as im based in the UK where is a good non expensive place to buy from? Thanks again!!!