Memory Limits for Windows and Windows Server Releases

• 2018/05/31
• 9 分鐘閱讀時長

https://docs.microsoft.com/zh-cn/windows/desktop/Memory/memory-limits-for-windows-releases

This topic describes the memory limits for supported Windows and Windows Server releases.

• Memory and Address Space Limits
• Physical Memory Limits: Windows?10
• Physical Memory Limits: Windows Server?2016
• Physical Memory Limits: Windows?8
• Physical Memory Limits: Windows Server?2012
• 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?R2
• Physical Memory Limits: Windows Server?2003 with Service Pack?2 (SP2)
• Physical Memory Limits: Windows Server?2003 with Service Pack?1 (SP1)
• Physical Memory Limits: Windows Server?2003
• Physical Memory Limits: Windows?XP
• Physical Memory Limits: Windows Embedded
• How graphics cards and other devices affect memory limits
• 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.

4-gigabyte tuning (4GT), also known as application memory tuning, or the /3GB switch, is a technology (only applicable to 32 bit systems) that alters the amount of virtual address space available to user mode applications. Enabling this technology reduces the overall size of the system virtual address space and therefore system resource maximums. For more information, see?What is 4GT.

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 typeLimit on X86Limit 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_AWAREcleared (default) 4 GB with?IMAGE_FILE_LARGE_ADDRESS_AWAREset
User-mode virtual address space for each 64-bit process	Not applicable	With IMAGE_FILE_LARGE_ADDRESS_AWARE?set (default): x64:?8 TB Intel Itanium-based systems:?7 TB Windows?8.1 and Windows Server?2012?R2:?128 TB 2 GB with?IMAGE_FILE_LARGE_ADDRESS_AWAREcleared
Kernel-mode virtual address space	2 GB From 1 GB to a maximum of 2 GB with 4GT	8 TBWindows?8.1 and Windows Server?2012?R2:128 TB
Paged pool	384 GB or system commit limit, whichever is smaller.?Windows?8.1 and Windows Server?2012?R2:?15.5 TB 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?8.1 and Windows Server?2012?R2:?15.5 TB 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?8.1 and Windows Server?2012?R2:?RAM or 16 TB, whichever is smaller (address space is limited to 2 x RAM). 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?8.1 and Windows Server?2012?R2:?RAM or 16 TB, 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?SystemCacheLimitregistry key value. Windows?8.1 and Windows Server?2012?R2:?16 TB. 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?8.1 and Windows Server?2012?R2:?16 TB. Windows Server?2003 and Windows?XP:?Up to 1 TB depending on configuration and RAM.

?

Physical Memory Limits: Windows 10

The following table specifies the limits on physical memory for Windows?10.

VersionLimit on X86Limit on X64

Windows?10 Enterprise	4 GB	2TB
Windows?10 Education	4 GB	2TB
Windows?10 Pro	4 GB	2TB
Windows?10 Home	4 GB	128GB

?

Physical Memory Limits: Windows Server 2016

The following table specifies the limits on physical memory for Windows Server?2016.

VersionLimit on X64

Windows Server?2016 Datacenter	24 TB
Windows Server?2016 Standard	24 TB

?

Physical Memory Limits: Windows 8

The following table specifies the limits on physical memory for Windows?8.

VersionLimit on X86Limit 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.

VersionLimit 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.

VersionLimit on X86Limit 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.

VersionLimit on X64Limit 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.

VersionLimit on X86Limit on X64Limit 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.

VersionLimit on X86Limit 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.

VersionLimit on X86Limit 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.

VersionLimit on X86Limit on X64Limit 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.

VersionLimit on X86Limit on X64Limit 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.

VersionLimit on X86Limit 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.

VersionLimit on X86Limit on X64Limit 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.

VersionLimit on X86Limit 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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How graphics cards and other devices affect memory limits

Devices have to map their memory below 4 GB for compatibility with non-PAE-aware Windows releases. Therefore, if the system has 4GB of RAM, some of it is either disabled or is remapped above 4GB by the BIOS. If the memory is remapped, X64 Windows can use this memory. X86 client versions of Windows don’t support physical memory above the 4GB mark, so they can’t access these remapped regions. Any X64 Windows or X86 Server release can.

X86 client versions with PAE enabled do have a usable 37-bit (128 GB) physical address space. The limit that these versions impose is the highest permitted physical RAM address, not the size of the IO space. That means PAE-aware drivers can actually use physical space above 4 GB if they want. For example, drivers could map the "lost" memory regions located above 4 GB and expose this memory as a RAM disk.

轉載于:https://www.cnblogs.com/jinanxiaolaohu/p/9273462.html

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