I have recently upgraded my MBP Penryn 15inch 2.4ghz memory from 2GB to 4GB. in activity monitor, i have never had page outs when the the mbp was using 2GB only, it was always "0" page outs. but since i upgraded to 4GB of ram, the current page outs is 284MB with free memory 398mb. i checked activity monitor that there is no fishy indication. it's all seem look normal to me. my use of this mbp now is still the same when the mbp only had 2GB of ram. same applications and stuff. can anyone explain something i don't know here? sorry about my bad english. it's not my mother language. thanks.