For more information, see What is 4GT. Limits on physical memory for bit platforms also depend on the Physical Address Extension PAE , which allows bit Windows systems to use more than 4 GB of physical memory. The following table specifies the limits on memory and address space for supported releases of Windows. Unless otherwise noted, the limits in this table apply to all supported releases. The following table specifies the limits on physical memory for Windows Server Windows Server is available only in X64 editions.
The following table specifies the limits on physical memory for Windows Server R2. Windows Server R2 is available only in bit editions. If the memory is remapped, X64 Windows can use this memory. Any X64 Windows or X86 Server release can. The limit that these versions impose is the highest permitted physical RAM address, not the size of the IO space.
For example, drivers could map the "lost" memory regions located above 4 GB and expose this memory as a RAM disk. Physical Address Extension. Evaluations Unlimited. Windows Server Essentials.
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