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I have installed windows 7 in one of my machine. It has 2 GB RAM but when work for some time it gets very slow when see performance tab of windows task manager (Available + cached + Free ) memory not add up to 2 GB its some what very less than that( last check 1.2 GB).?

Cached memory showed after some time >500 MB. Please explain exactly how to control cached memory that shows up in task manager performance tab. computer becomes very slow after some time when this value goes high.?

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The memory columns in Task Manager do not accurately represent the memory usage of a Windows machine. I would recommend something like Process Explorer from SysInternals instead. – user3463 Feb 13 '11 at 5:25
Is there a question here? – aqua Feb 13 '11 at 5:59
Yeah - you cannot add up memory like that - it's not so simple. Refer to this related q – Sathya Feb 13 '11 at 11:04
up vote 3 down vote accepted

Click Start, type in Resource Monitor and press Enter. Now click on the Memory tab for a better representation of your RAM usage (including total memory).

Sample screenshot from Google Images: Sample screenshot from Google Images

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