6gb ram installed but only 2.90 shows?

I have widows 7 64bit. I upgraded the memory from 3gb to 6gb but it only shows 2.90gb of availible ram
why is this I should have more ram.
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More about installed shows
  1. does your bios read all 6? if it does run msconfig go to the boottab then advanced options and check the maximum memory box restart the computer and see what happens
  2. phiwri said:
    I have widows 7 64bit. I upgraded the memory from 3gb to 6gb but it only shows 2.90gb of availible ram
    why is this I should have more ram.

    Reseat the RAM.
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