This is interesting to see how it evolves. You use one of the few programs (CAD being the other type) that can really make use of a lot of RAM. All I ever use seems to ignore my 8GB of RAM and more than half of it is free - except when I run my virtual machines for Windows 8 and Ubuntu. But even with both running, I still have a big marging of free space. But right now, mosst of my RAM is not being used.