It does give 4 GB of addressable space, but many things are memory mapped by the OS, and so on a 32-bit system you end up with anywhere from 2.8 to 3.5 GB of addressable memory.
So by 2GB he meant usable, not addressable? I understand that addressable RAM != 4GB due to graphics card memory, BIOS, etc. but 2GB is way less than you could get on a 32-bit server. I just wanted to understand if there's something I'm missing.
