Windows 2000 Physical Memory Limits






Version Limit in 32-bit Windows Limit in 64-bit Windows
Windows 2000 Professional 4 GB N/A
Windows 2000 Server 4 GB N/A
Windows 2000 Advanced Server 8 GB N/A
Windows 2000 Datacenter Server 32 GB N/A


Source:
http://msdn.microsoft.com/en-us/library/aa366778