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32-bit computing platforms such as Intel x86-based computers treat physical memory addresses as 32-bit integers. Hence, a byte-addressable 32-bit computer can address 232 = 4,294,967,296 bytes of memory, or 4 gigabytes of RAM directly.
A 64-bit computer such as an AMD Opteron-based server or an Intel EM64T-based server can theoretically address 264 bytes (16 exabytes) of RAM. As of today, this means the memory addressability is essentially unlimited on 64-bit hardware - - - Source
Originally posted by InSpiteOf
Ya, Ive read elsewhere that 64bit OS' tend to have a lot less support and the drivers tend to suck or need serious updates.