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By default windows 7 does not use the full available RAM memory.When you check My Computer properties in windows 7 32 bit & 64 bit,you can note that memory will be 3.7 for 4 GB and 7.1 for 8GB RAM.It clearly show that the compleat ram in not used.So you can force the machine to use the complete memory.
Follow the Steps Below
Step 01:Click Start (round orb).
Step 02:Click the Run… button and, in the blank field, type msconfig and press the Enter button.
Step 03:Now, click the Boot tab
Step 04:Click the Advanced Options… button.
Step 05:Tick the Maximum Memory checkbox and click OK.
Step 06:Restart the computer for the changes to take full effect
Please see the following screencast for details: