Sometimes operating systems like to take a chunk of ram for themselves, and under no circumstances can anything else use it. Like under Windows 7, I have Total Ram, Cached Ram, Available Ram, and Free Ram. Right now I have 1534 MB total(actually 1536 installed, rounding error?), 763MB cached, 801MB Available and 87MB Free. Figure that one out. It also says the Kernel is using 144MB of paged memory, and 27MB of non paged memory. I'm assuming that means no matter what, at least 27MB of RAM is going to be used by the Kernel.
