My god...seriously you have a ---- load of RAM, just let the fricken computer use it. Why else did you pay for it. I was I had that much RAM, seriously you people are driving me insane. Oh my computer/application/whatever is using all this RAM!!!!!!111eleven. If you do not want to use all the RAM remove from the computer...
Performance is enhanced when applications/OS use your RAM not the other way around. If they do not use RAM they are using the Hard Drive. You should be proud you are using as much RAM as you are. You have 8 fricken gigabytes of RAM, its not in short supply. So, stop watching/monitoring your RAM usage.
[swearing omitted with great reluctance]