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Revisione 09:49, 8 Lug 2008
Memory Limits for Windows Releases
This topic describes memory limits for supported Windows releases:
* Memory and Address Space Limits * Physical Memory Limits: Windows Server 2008 * Physical Memory Limits: Windows Vista * Physical Memory Limits: Windows Home Server * Physical Memory Limits: Windows Server 2003 * Physical Memory Limits: Windows XP * Physical Memory Limits: Windows 2000
Limits on memory and address space vary by platform, operating system, and by whether the IMAGE_FILE_LARGE_ADDRESS_AWARE value of the LOADED_IMAGE [ http://msdn.microsoft.com/en-us/library/ms680349(VS.85,printer).aspx ] structure and 4-gigabyte tuning [ http://msdn.microsoft.com/en-us/library/bb613473(VS.85,printer).aspx ] (4GT) are in use.
Limits on physical memory for 32-bit platforms also depend on the Physical Address Extension [ http://msdn.microsoft.com/en-us/library/aa366796(VS.85,printer).aspx ] (PAE), which allows 32-bit Windows systems to use more than 4 GB of physical memory. Memory and Address Space Limits
The following table specifies the limits on memory and address space for supported releases of Windows. Memory type Limit in 32-bit Windows 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_AWARE and 4GT
2 GB
4 GB with IMAGE_FILE_LARGE_ADDRESS_AWARE User-mode virtual address space for each 64-bit process
Not applicable
2 GB
x64: 8 TB with IMAGE_FILE_LARGE_ADDRESS_AWARE
Intel IPF: 7 TB with IMAGE_FILE_LARGE_ADDRESS_AWARE
Kernel-mode virtual address space
2 GB
From 1 GB to a maximum of 2 GB with 4GT
8 TB
Paged pool
Limited by available kernel-mode virtual address space or the PagedPoolLimit [ http://msdn.microsoft.com/en-us/library/bb870880(VS.85,printer).aspx ] registry key value.
Windows Vista: Limited only by kernel mode virtual address space. Starting with Windows Vista 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
Windows 2000: 350 MB
128 GB
Windows Server 2003 and Windows XP: Up to 128 GB depending on configuration and RAM.
Windows 2000: Not applicable
Nonpaged pool
Limited by available kernel-mode virtual address space, the NonPagedPoolLimit [ http://msdn.microsoft.com/en-us/library/bb870880(VS.85,printer).aspx ] registry key value, or physical memory.
Windows Vista: Limited only by kernel mode virtual address space and physical memory. Starting with Windows Vista SP1, the nonpaged pool can also be limited by the NonPagedPoolLimit [ http://msdn.microsoft.com/en-us/library/bb870880(VS.85,printer).aspx ] registry key value.
Windows Home Server, Windows Server 2003, and Windows XP/2000: 256 MB, or 128 MB with 4GT.
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.
Windows 2000: Not applicable
System cache virtual address space (physical size limited only by physical memory)
Limited by available kernel-mode virtual address space or the SystemCacheLimit [ http://msdn.microsoft.com/en-us/library/bb870880(VS.85,printer).aspx ] registry key value.
Windows Vista: Limited only by kernel mode virtual address space. Starting with Windows Vista SP1, system cache virtual address space can also be limited by the SystemCacheLimit [ http://msdn.microsoft.com/en-us/library/bb870880(VS.85,printer).aspx ] registry key value.
Windows Home Server, Windows Server 2003, and Windows XP/2000: 860 MB with LargeSystemCache [ http://go.microsoft.com/fwlink/?LinkId=97918 ] 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.
Windows 2000: Not applicable
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 in 32-bit Windows Limit in 64-bit Windows Windows Server 2008 Datacenter (full installation)
64 GB
2 TB
Windows Server 2008 Datacenter (Server Core installation)
64 GB
2 TB
Windows Server 2008 Enterprise
64 GB
2 TB
Windows Server 2008 Standard
4 GB
32 GB
Windows Server 2008 for Itanium-Based Systems
Not applicable
2 TB
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 in 32-bit Windows Limit in 64-bit Windows 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
4 GB
Not applicable
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
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 in 32-bit Windows Limit in 64-bit Windows Windows Server 2003 Service Pack 2 (SP2), Datacenter Edition
128 GB
64 GB with 4GT
2 TB
Windows Server 2003 Service Pack 2 (SP2), Enterprise Edition
64 GB
2 TB
Windows Storage Server 2003, Enterprise Edition
8 GB
Not applicable
Windows Storage Server 2003
4 GB
Not applicable
Windows Server 2003 R2 Datacenter Edition
Windows Server 2003 with Service Pack 1 (SP1), Datacenter Edition
128 GB
16 GB with 4GT
1 TB
Windows Server 2003 R2 Enterprise Edition
Windows Server 2003 with Service Pack 1 (SP1), Enterprise Edition
64 GB
16 GB with 4GT
1 TB
Windows Server 2003 R2 Standard Edition
Windows Server 2003, Standard Edition SP1
4 GB
32 GB
Windows Server 2003, Datacenter Edition
128 GB
16 GB with 4GT
512 GB
Windows Server 2003, Enterprise Edition
32 GB
16 GB with 4GT
64 GB
Windows Server 2003, Standard Edition
4 GB
16 GB
Windows Server 2003, Web Edition
2 GB
Not applicable
Windows Small Business Server 2003
4 GB
Not applicable
Windows Compute Cluster Server 2003
Not applicable
32 GB
Physical Memory Limits: Windows XP
The following table specifies the limits on physical memory for Windows XP. Version Limit in 32-bit Windows Limit in 64-bit Windows Windows XP
4 GB
128 GB
Windows XP Starter Edition
512 MB
Not applicable
Physical Memory Limits: Windows 2000
The following table specifies the limits on physical memory for Windows 2000. Version Limit in 32-bit Windows Windows 2000 Professional
4 GB
Windows 2000 Server
4 GB Windows 2000 Advanced Server
8 GB Windows 2000 Datacenter Server
32 GB