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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?

(Of course, "show processes from all users" is checked)

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Like phonebus said, its cacheing. Stuff is kept in memory jsut in case you might use it soon again.. but its not committed- so if you run low on RAM its starts dumping this uncommited ram for active processes that need it now. On machines with 2/4gb this is not noticeable because we constantly run new processes and this cahced ram gets dumped quicker. Nothing to worry about. –  ppumkin Jan 4 '12 at 13:34
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up vote 5 down vote accepted

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!

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