Windows Maximum Addressable Memory Reference

 

Windows Versions (and their maximum addressable physical memory/RAM (GB))	32-bit Editions	64-bit Editions
Windows 2000 Professional, Server	4	N/A
Windows 2000 Advanced Server	8	N/A
Windows 2000 Datacenter	32	N/A
Windows XP Starter	0.5	N/A
Windows XP Home & Media Center	4	N/A
Windows XP Professional	4	128
Windows Server 2003 Web	2	N/A
Windows Server 2003 Small Business, Home, Storage	4	N/A
Windows Server 2003 Enterprise Storage	8	N/A
Windows Server 2003 Standard (SP1/SP2/R2)	4	32
Windows Server 2003 Enterprise (SP2)	64	2048
Windows Server 2003 Datacenter (SP2)	128	2048
Windows Vista Starter	1	N/A
Windows Vista Home Basic	4	8
Windows Vista Home Premium	4	16
Windows Vista Business, Enterprise, Ultimate	4	128
Windows Server 2008 Standard, Web	4	32
Windows Server 2008 Enterprise, Datacenter	64	2048
Windows 7 Starter	2	N/A
Windows 7 Home Basic	4	8
Windows 7 Home Premium	4	16
Windows 7 Professional, Enterprise, Ultimate	4	192
Windows Server 2008 R2 Foundation	N/A	8
Windows Server 2008 R2 Standard	N/A	32
Windows Server 2008 R2 Enterprise, Datacenter, or Itanium	N/A	2048