Ok so my RAM is behaving weirdly. I have 1.5 GB of the stuff, and sometimes, when i've got 2-3 torrents running, or i'm scanning something in high-res (2400DPI), or I have 3 pages of safari open for a while with iTunes, the usage is through the roof. Sometimes I have as little as 13mb of RAM spare. When I reset my disk permissions, I get it all back straight away! Is this a harddrive writing in/out issue? I'm trying to understand what could be the problem? My HD is running at 5400 rpm, is this the bottleneck causing my RAM to be annihilated? Why am I getting it all back with a disk permission repair?