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
|
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.
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