So why does Microsoft 32 Bit versions of Vista and 7 only support 4GB of memory? Its not because they don't support the PAE feature of x86 CPU's, but rather because they self impose the limit. This explains why even with 4GB of memory, you usually dont see all of it. Something else you might want to read would be 3GB Barrier. This allows those CPU's supporting that feature to effectively address up to 64GB of total memory. Most modern CPU's (Since the Pentium Pro Era, circa 1995) have included support for the Page Address Extension (PAE).
If your wondering why I said "self imposed", its because the 4GB limit is not a limitation of the 32 Bit operating mode on modern x86 CPU's.
The purpose of this article is to demonstrate how to disable the self imposed 4GB memory limit on 32 Bit (x86) versions of Windows Vista and Windows 7.
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