If you're a noobie to Linux like I am then you sometimes get confused about all the different types that are talked about.
Unity, KDE, Xfce, ext. don't mean much to you when you hear about them. I ran across this link that really helped to explain it all to me and how the different desktop environments use RAM and CPU's and what they look like. Figured I'd pass it on to others here so they can read up and understand how this stuff works. Anyway, enjoy.