32-bit CPUs can use more than 4GB of RAM - M$ Artificial Cap Alert

[Lucky]

http://en.wikipedia.org/wiki/Physical_Address_Extension

In computing, Physical Address Extension (PAE) is a feature to allow 32-bit x86 processors to access a physical address space (including random access memory and memory mapped devices) larger than 4 gigabytes.

First implemented in the Intel Pentium Pro in 1995, it was extended by AMD...

http://en.wikipedia.org/wiki/3_GB_ba...n_dependencies

The final piece of the 3 GB barrier puzzle[according to whom?] is a limit deliberately coded by Microsoft into the "non-server", or "client", x86 editions of Microsoft Windows: Windows XP, Windows Vista, and Windows 7. The 32-bit (x86) versions of these are able to operate x86 processors in PAE mode, and do so by default as long as the CPU present supports the NX bit.[9] Nevertheless, these operating systems do not permit addressing of physical memory above the 4 GB address boundary. This is not an architectural limit; it is a limit imposed by Microsoft as a workaround for driver compatibility issues that were discovered during testing.[14]

Use Linux.