This is in this months Maximum PC page 23 sidebar.
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Our RAM configuration isn't that simple, though. Although the board
posts just fine with 4GB, running a 32-bit windows OS doesn't quite
give you full access to the RAM. Check Windows XP and it'll report
only 3.25GB free. So is the other .75GB wasted? Not quite. It's a
complicated issue, but Microsoft argues that even if the applications
cannot use all 4GB of RAM, the OS, and even the drivers, will, so the
additional headroom does help.
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