Hello, I own a 2008 Mac Pro (2.8 8 core). I am a heavy multi-tasker and power user, but I don't use professional software (graphics, video-editing) very often. More often than not, I use my computer for personal entertainment (movies, IM, browsing, music, etc). I got my Mac Pro with 2 gigs of ram, but with my usage, it ran very poorly, so I upgraded to 4 gigs. That helped, but I constantly found myself out of ram with a lot of "page outs." I finally just upgraded to 8 gigs of ram, and within an hour, all my free ram is gone and the "page outs" start piling up again. Do I really need more than 8 gigs of ram? Where is my ram going? I mean, I consider my usage rather light. I just don't understand this.