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Memory and Address Space Limits
The following table specifies the limits on memory and address space for supported releases of Windows. Unless otherwise noted, the limits in this table apply to all supported releases.
| Memory type | Limit in on X86 | Limit in 64-bit Windows |
|---|---|---|
|
User-mode virtual address space for each 32-bit process
|
2 GB
Up to 3 GB with IMAGE_FILE_LARGE_ADDRESS_AWAREand 4GT
|
2 GB withIMAGE_FILE_LARGE_ADDRESS_AWAREcleared (default)
4 GB withIMAGE_FILE_LARGE_ADDRESS_AWAREset
|
|
User-mode virtual address space for each 64-bit process
|
Not applicable
|
With IMAGE_FILE_LARGE_ADDRESS_AWAREset (default):
x64: 8 TB
Intel Itanium-based systems: 7 TB
Windows 8.1 and later: 128 TB
2 GB withIMAGE_FILE_LARGE_ADDRESS_AWAREcleared
|
|
Kernel-mode virtual address space
|
2 GB
From 1 GB to a maximum of 2 GB with 4GT
|
8 TB
Windows 8.1 and later: 128 TB
|
|
Paged pool
|
384 GB or system commit limit, whichever is smaller.
Windows Server 2008 R2, Windows 7, Windows Server 2008, and Windows Vista: Limited by available kernel-mode virtual address space. Starting with Windows Vista with Service Pack 1 (SP1), the paged pool can also be limited by the PagedPoolLimit registry key value.
Windows Home Server and Windows Server 2003: 530 MB
Windows XP: 490 MB
|
384 GB or system commit limit, whichever is smaller
Windows Server 2008 R2, Windows 7, Windows Server 2008, and Windows Vista: 128 GB or system commit limit, whichever is smaller
Windows Server 2003 and Windows XP: Up to 128 GB depending on configuration and RAM.
|
|
Nonpaged pool
|
75% of RAM or 2 GB, whichever is smaller.
Windows Vista: Limited only by kernel mode virtual address space and physical memory. Starting with Windows Vista with SP1, the nonpaged pool can also be limited by the NonPagedPoolLimit registry key value.
Windows Home Server, Windows Server 2003, and Windows XP: 256 MB, or 128 MB with 4GT.
|
RAM or 128 GB, whichever is smaller (address space is limited to 2 x RAM)
Windows Server 2008 R2, Windows 7, and Windows Server 2008: 75% of RAM up to a maximum of 128 GB
Windows Vista: 40% of RAM up to a maximum of 128 GB.
Windows Server 2003 and Windows XP: Up to 128 GB depending on configuration and RAM.
|
|
System cache virtual address space (physical size limited only by physical memory)
|
Limited by available kernel-mode virtual address space or the SystemCacheLimit registry key value.
Windows Vista: Limited only by kernel mode virtual address space. Starting with Windows Vista with SP1, system cache virtual address space can also be limited by the SystemCacheLimit registry key value.
Windows Home Server, Windows Server 2003, and Windows XP: 860 MB with LargeSystemCache registry key set and without 4GT; up to 448 MB with 4GT.
|
Always 1 TB regardless of physical RAM
Windows Server 2003 and Windows XP: Up to 1 TB depending on configuration and RAM.
|
Physical Memory Limits: Windows 8
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
|
Physical Memory Limits: Windows Server 2012
The following table specifies the limits on physical memory for Windows Server 2012. Windows Server 2012 is available only in X64 editions.
| Version | Limit on X64 |
|---|---|
| Windows Server 2012 Datacenter |
4 TB
|
| Windows Server 2012 Standard |
4 TB
|
| Windows Server 2012 Essentials |
64 GB
|
| Windows Server 2012 Foundation |
32 GB
|
| Windows Storage Server 2012 Workgroup |
32 GB
|
| Windows Storage Server 2012 Standard |
4 TB
|
| Hyper-V Server 2012 |
4 TB
|
Physical 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
|
Physical Memory Limits: Windows Server 2008 R2
The following table specifies the limits on physical memory for Windows Server 2008 R2. Windows Server 2008 R2 is available only in 64-bit editions.
| Version | Limit on X64 | Limit on IA64 |
|---|---|---|
| Windows Server 2008 R2 Datacenter |
2 TB
|
|
| Windows Server 2008 R2 Enterprise |
2 TB
|
|
| Windows Server 2008 R2 for Itanium-Based Systems |
2 TB
|
|
| Windows Server 2008 R2 Foundation |
8 GB
|
|
| Windows Server 2008 R2 Standard |
32 GB
|
|
| Windows HPC Server 2008 R2 |
128 GB
|
|
| Windows Web Server 2008 R2 |
32 GB
|
Physical Memory Limits: Windows Server 2008
The following table specifies the limits on physical memory for Windows Server 2008. Limits greater than 4 GB for 32-bit Windows assume that PAE is enabled.
| Version | Limit on X86 | Limit on X64 | Limit on IA64 |
|---|---|---|---|
| Windows Server 2008 Datacenter |
64 GB
|
1 TB
|
|
| Windows Server 2008 Enterprise |
64 GB
|
1 TB
|
|
| Windows Server 2008 HPC Edition |
128 GB
|
||
| Windows Server 2008 Standard |
4 GB
|
32 GB
|
|
| Windows Server 2008 for Itanium-Based Systems |
2 TB
|
||
| Windows Small Business Server 2008 |
4 GB
|
32 GB
|
|
| Windows Web Server 2008 |
4 GB
|
32 GB
|
Physical Memory Limits: Windows Vista
The following table specifies the limits on physical memory for Windows Vista.
| Version | Limit on X86 | Limit on X64 |
|---|---|---|
| Windows Vista Ultimate |
4 GB
|
128 GB
|
| Windows Vista Enterprise |
4 GB
|
128 GB
|
| Windows Vista Business |
4 GB
|
128 GB
|
| Windows Vista Home Premium |
4 GB
|
16 GB
|
| Windows Vista Home Basic |
4 GB
|
8 GB
|
| Windows Vista Starter |
1 GB
|
Physical Memory Limits: Windows Home Server
Windows Home Server is available only in a 32-bit edition. The physical memory limit is 4 GB.
Physical Memory Limits: Windows Server 2003 R2
The following table specifies the limits on physical memory for Windows Server 2003 R2. Limits over 4 GB for 32-bit Windows assume that PAE is enabled.
| Version | Limit on X86 | Limit on X64 |
|---|---|---|
|
Windows Server 2003 R2 Datacenter Edition
|
64 GB
(16 GB with 4GT)
|
1 TB
|
|
Windows Server 2003 R2 Enterprise Edition
|
64 GB
(16 GB with 4GT)
|
1 TB
|
|
Windows Server 2003 R2 Standard Edition
|
4 GB
|
32 GB
|
Physical Memory Limits: Windows Server 2003 with Service Pack 2 (SP2)
The following table specifies the limits on physical memory for Windows Server 2003 with Service Pack 2 (SP2). Limits over 4 GB for 32-bit Windows assume that PAE is enabled.
| Version | Limit on X86 | Limit on X64 | Limit on IA64 |
|---|---|---|---|
|
Windows Server 2003 with Service Pack 2 (SP2), Datacenter Edition
|
64 GB
(16 GB with 4GT)
|
1 TB
|
2 TB
|
|
Windows Server 2003 with Service Pack 2 (SP2), Enterprise Edition
|
64 GB
(16 GB with 4GT)
|
1 TB
|
2 TB
|
|
Windows Server 2003 with Service Pack 2 (SP2), Standard Edition
|
4 GB
|
32 GB
|
Physical Memory Limits: Windows Server 2003 with Service Pack 1 (SP1)
The following table specifies the limits on physical memory for Windows Server 2003 with Service Pack 1 (SP1). Limits over 4 GB for 32-bit Windows assume that PAE is enabled.
| Version | Limit on X86 | Limit on X64 | Limit on IA64 |
|---|---|---|---|
|
Windows Server 2003 with Service Pack 1 (SP1), Datacenter Edition
|
64 GB
(16 GB with 4GT)
|
X64 1 TB
|
1 TB
|
|
Windows Server 2003 with Service Pack 1 (SP1), Enterprise Edition
|
64 GB
(16 GB with 4GT)
|
X64 1 TB
|
1 TB
|
|
Windows Server 2003 with Service Pack 1 (SP1), Standard Edition
|
4 GB
|
32 GB
|
Physical Memory Limits: Windows Server 2003
The following table specifies the limits on physical memory for Windows Server 2003. Limits over 4 GB for 32-bit Windows assume that PAE is enabled.
| Version | Limit on X86 | Limit on IA64 |
|---|---|---|
|
Windows Server 2003, Datacenter Edition
|
64 GB
(16 GB with 4GT)
|
512 GB
|
|
Windows Server 2003, Enterprise Edition
|
64 GB
(16 GB with 4GT)
|
512 GB
|
|
Windows Server 2003, Standard Edition
|
4 GB
|
|
|
Windows Server 2003, Web Edition
|
2 GB
|
|
|
Windows Small Business Server 2003
|
4 GB
|
|
|
Windows Compute Cluster Server 2003
|
32 GB
|
|
|
Windows Storage Server 2003, Enterprise Edition
|
8 GB
|
|
|
Windows Storage Server 2003
|
4 GB
|
Physical Memory Limits: Windows XP
The following table specifies the limits on physical memory for Windows XP.
| Version | Limit on X86 | Limit on X64 | Limit on IA64 |
|---|---|---|---|
| Windows XP |
4 GB
|
128 GB
|
128 GB (not supported)
|
| Windows XP Starter Edition |
512 MB
|
N/A
|
N/A
|
Physical Memory Limits: Windows Embedded
The following table specifies the limits on physical memory for Windows Embedded.
| Version | Limit on X86 | Limit on X64 |
|---|---|---|
|
Windows XP Embedded
|
4 GB
|
|
|
Windows Embedded Standard 2009
|
4 GB
|
|
|
Windows Embedded Standard 7
|
4 GB
|
192 GB
|
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