The main advantage to use the 64-bit operating system is to allow 128 GB of RAM in PC, while the 32-bit OS can only support up to 4 GB RAM. Windows XP Professional X64 is a edition, and the 64-bit version of the Windows XP operating system released publicly on April 25, 2005. Features on this version of Windows are similar to Windows XP Pro 32-bit, the advantages of 64-bit OS will be additional only.
