My computer is using 6GB out of 8GB of RAM without proof

My computer is using 6GB out of 8GB of RAM without proof I have Windows 7 Home Premium with a AMD X4 965 Quad Core and 8GB of Crucial RAM. I have no idea why my computer says it is using 6GB of RAM when it doesn't show any reason. Below are the screen shots of my task manager:
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Guest [Entry]

"Caching. Your RAM is tens of times faster than your HDD, so starting with Vista, windows aggressively caches program data. It's a good thing - RAM'd be useless to you otherwise.

(It frees up if it's needed, don't worry)

edit: BlueRaja makes a good point - anybody interested should definately read Jeff's Post on the subject - his insights are once again invaluable to us all :)"