Ограничения размера памяти для разных версий Windows

Memory Limits for Windows Releases

This topic describes memory limits for supported Windows releases:

• Memory and Address Space Limits
• Physical Memory Limits: Windows 7
• Physical Memory Limits: Windows Server 2008 R2
• 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
• Related Topics

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 structure and 4-gigabyte tuning (4GT) are in use. IMAGE_FILE_LARGE_ADDRESS_AWARE is set or cleared by using the /LARGEADDRESSAWARE linker option.

Limits on physical memory for 32-bit platforms also depend on the Physical Address Extension (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. Unless otherwise noted, the limits in this table apply to all supported releases.

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 with IMAGE_FILE_LARGE_ADDRESS_AWARE cleared (default) 4 GB with IMAGE_FILE_LARGE_ADDRESS_AWARE set
User-mode virtual address space for each 64-bit process	Not applicable	With IMAGE_FILE_LARGE_ADDRESS_AWARE set (default): x64:  8 TB Intel IPF:  7 TB 2 GB with IMAGE_FILE_LARGE_ADDRESS_AWARE cleared
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 registry key value. Windows Vista:  Limited only by 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 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 registry key value, or physical memory. 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/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 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/2000:  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. Windows 2000:  Not applicable

Physical Memory Limits: Windows 7

The following table specifies the limits on physical memory for Windows 7.

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.

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.

Physical Memory Limits: Windows Vista

The following table specifies the limits on physical memory for Windows Vista.

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.

Physical Memory Limits: Windows XP

The following table specifies the limits on physical memory for Windows XP.

Physical Memory Limits: Windows 2000

The following table specifies the limits on physical memory for Windows 2000.

Related Topics

4-Gigabyte Tuning

IMAGE_FILE_LARGE_ADDRESS_AWARE

Physical Address Extension

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