4GB of installed Ram-- XP says 3.23 GB [duplicate]

4GB of installed Ram-- XP says 3.23 GB [duplicate] I have a Dell desktop that had 2GB of Ram in it, but XP's control panel -> system setting said only 1.75 GB. (This is 32 bit XP.)
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Guest [Entry]

"32-bit Windows XP can only address up to a maximum of ~3.5 GB of RAM. The other 256MB or so is probably shared with your integrated graphics card.

You need a 64-bit operating system to use 4GB or more of RAM. Windows XP 64-bit is not recommended because few companies have drivers that support 64-bit Windows XP. Most start at Windows Vista 64 at least."