The following table specifies the limits on physical memory for Windows 8.
Version=
Limit on X86 - Limit on X64
Windows 8 Enterprise
4 GB - 512 GB
Windows 8 Professional
4 GB - 512 GB
Windows 8
4 GB - 128 GB
Memory Limits: Windows 7
The following table specifies the limits on physical memory for Windows 7.
Version=
Limit on X86 - Limit on X64
Windows 7 Ultimate
4 GB - 192 GB
Windows 7 Enterprise
4 GB - 192 GB
Windows 7...
The following table specifies the limits on physical memory for Windows 8.
Version=
Limit on X86 - Limit on X64
Windows 8 Enterprise
4 GB - 512 GB
Windows 8 Professional
4 GB - 512 GB
Windows 8
4 GB - 128 GB
Memory Limits: Windows 7
The following table specifies the limits on physical memory for Windows 7.
Version=
Limit on X86 - Limit on X64
Windows 7 Ultimate
4 GB - 192 GB
Windows 7 Enterprise
4 GB - 192 GB
Windows 7 Professional
4 GB - 192 GB
Windows 7 Home Premium
4 GB - 16 GB
Windows 7 Home Basic
4 GB - 8 GB
Windows 7 Starter
2 GB - N/A