I have a 2007 Mac Pro, 2GB 2 x 2.66 GHz Dual-Core Intel Xeon I was checking the activity monitor and looking at the RAM and reading Apple's doc and the Activity Monitor RAM section. At this moment, all I have is Firefox, Activity Monitor open and that's it, obviously there's system stuff going on as well. I took a pic and attached it. Though is USED 1.25GB high, as it sounds real high to me. Is it too high, if so how can I lower it? The Mac works fine. I've been thinking to increase the RAM recently, and purchasing an extra 4 or 8 GBs I have Intego's Virus Barrier too, any need for this?