I have 8GB memory, but only shows total of 6GB

I have an early 2009 iMac with 8GB of memory, and before I upgraded to Mavericks, it would show a total of 8GB between used and available memory in my memory cleaning app.
Now, it only shows a total of 6GB between used and available memory.
Any reason it's not reporting the full 8GB of available memory?
Thanks,

What memory cleaning app and why are you using it...?
How much does "About This Mac" report..?
How much does "Activity Monitor" report..?

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