For Windows Server 2008 Enterprise/Datacenter 32-bit RAM access more than 4GB of pysical memory.
Method:
1. Run command prompt as Administrator.
2. Type bcdedit /set PAE forceenable.
3. Restart Server.
Memory Limit for windows releases: http://msdn.microsoft.com/en-us/library/aa366778(VS.85).aspx#physical_memory_limits_windows_server_2008
Sources: http://msdn.microsoft.com/en-us/library/aa366796(v=vs.85).aspx
