Dell Latitude E6520 did not recognize the 8 GB of ram

Hi, I have a DELL latitude E6520 service tag 33X0ZN1 with 4 GB ram and Windows 7 32-bit

I installed 4 GB of ram, bios seem to see "8 GB of ram", but when I start Windows it can use only 3.2 GB of ram. Why?

This is due to the 32-bit operating system?

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