Why my Lenovo T410 with 32bit Windows 7 uses only 2.92 gb RAM out of 6.00 gb?

Infinity7

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Feb 1, 2014
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Why my Lenovo T410 with 32bit Windows 7 uses only 2.92 gb RAM out of 6.00 gb?

This is what I see at Control Panel\System and Security\System:

Installed memory (RAM): 6.00 GB (2.92 GB usable)

I would expect a 32bit Windows to use 4 gb