hey! ive got an iBook G4 1Ghz, 256MB RAM, etc. and want to upgrade to 640MB RAM, maxing out. However, will i notice any difference using my ibook from 256 to 640? I know it might run alot faster, but will games like tony hawk 4 and medal of honor allied assualt run faster and smoother? I'll probably buy from crucial.com so it will be quality RAM. Thanks