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What comprises the 'free Physical memory' in task manager?

What comprises the 'free Physical memory' in task manager?

Task manager reports 85% physical memory (on a 48 Gigabyte machine, Windows Server 2008 64 bit). The sum of the private bytes taken by processes is around 13-14 gigs. Where is the remaining memory?

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Guest [Entry]

The biggest chunk of it will be caching, which Windows 7/Windows 2008 have greatly improved upon. Remember, RAM that isn't being used well is being wasted!