I own a Mac Pro (Tower) with 32GB RAM that I bought about four months ago. I installed Windows 7 Ultimate and it says only 1.99GB of RAM out of 32GB's is usable?
closed as off topic by EEAA, Shane Madden, HopelessN00b, Chris S♦ Feb 26 at 5:55
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Your Mac Pro's BIOS was not designed to preserve low address space for a 32-bit operating system. You should install the 64-bit version of Windows 7. It's moving all the memory out of the way of hardware mappings. Unfortunately, a 32-bit operating system can't access memory that has been remapped above the 4GB barrier.