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The 32-bit versions of Microsoft operating systems support physical memory up to the following limits:
Operating System (32-bit version) Max. Physical Memory
Windows XP 4 GB
Windows XP Starter Edition 256 MB
Windows Vista (all variants except Starter) 4 GB
Windows Vista Starter 1 GB
Windows 2003 Standard Edition 4 GB
Windows 2003 Standard Edition, SP1 4 GB
Windows 2003 Enterprise Server 32 GB; 16 GB with /3GB
Windows 2003 Enterprise Server, SP1 64 GB; 16 GB with /3GB
Windows 2003 Datacenter Server 128 GB; 16 GB with /3GB
Windows 2003 Datacenter Server, SP1 128 GB; 16 GB with /3GB
Physical Memory Limits in 64-bit versions of some operating systems:
Operating System Max. phys. Memory
Windows XP Professional x64 128 GB
Windows 2003 Standard Server x64 16 GB
Windows 2003 Standard Server x64, SP1 32 GB
Windows 2003 Enterprise Server x64 64 GB
Windows 2003 Enterprise Server x64, SP1 1 TB
Windows 2003 Datacenter Server x64 512 GB
Windows 2003 Datacenter Server x64, SP1 1 TB
Windows Vista 64, Home Basic 8 GB
Windows Vista 64, Home Premium 16 GB
Windows Vista 64, Business 128 GB
Windows Vista 64, Enterprise 128 GB
Windows Vista 64, Ultimate 128 GB
Linux 16 000 000 TB
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