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Windows RAM Limits (32-Bit and 64-Bit)

Windows 7

Windows 7 Ultimate: 4 GB (32-Bit), 192 GB (64-Bit)
Windows 7 Enterprise: 4 GB (32-Bit), 192 GB (64-Bit)
Windows 7 Professional: 4 GB (32-Bit), 192 GB (64-Bit)
Windows 7 Home Premium: 4 GB (32-Bit), 16 GB (64-Bit)
Windows 7 Home Basic: 4 GB (32-Bit), 8 GB (64-Bit)
Windows 7 Starter: 2 GB (32-Bit), 2 GB (64-Bit)

Windows Vista

Windows Vista Ultimate: 4 GB (32-Bit),  128 GB (64-Bit)
Windows Vista Enterprise: 4 GB (32-Bit), 128 GB (64-Bit)
Windows Vista Business: 4 GB (32-Bit), 128 GB (64-Bit)
Windows Vista Home Premium: 4 GB (32-Bit), 16 GB (64-Bit)
Windows Vista Home Basic: 4 GB (32-Bit), 8 GB (64-Bit)
Windows Vista Starter: 1 GB (32-Bit), N/A (64-Bit)

Windows XP

Windows XP (All Versions): 4 GB (32-Bit), 128 GB (64-Bit)
Windows XP Starter Edition: 512 MB (32-Bit),  N/A  (64-Bit)
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