RE: Is WinXP Pro 64-Bit Edition a True 64-Bit OS?
- From: v-kzhao@xxxxxxxxxxxxxxxxxxxx (Ken Zhao [MSFT])
- Date: Fri, 03 Jun 2005 07:13:10 GMT
Hi Santosh,
Thank you for your posting and thanks for Bobby's information!
It seems that you have some concerns of hardware in Windows XP Professional
x64 Edition.
Based on my knowledge, first of all, Microsoft Windows XP Professional x64
Edition is a true 64-bit OS.
As far as I know, currently supported processors include the following:
AMD? Athlon? 64 (FX)
AMD? Opteron?
AMD? Turion?
Intel? Xeon? with Intel EM64T support
Intel? Pentium? 4 with Intel EM64T support
The x64 processor architecture allows for native execution of 32-bit code
with no emulation overhead required. WOW64 is the 32-bit Windows emulation
layer on 64-bit Windows, and provides compatibility with 32-bit Windows
applications. The WOW64 subsystem enables 32-bit programs to run without
modification on the x64-based versions of Windows Server 2003 and of
Windows XP Professional x64 Edition. The WOW64 subsystem does this by
creating a 32-bit environment on the x64-based versions of Windows Server
2003 and of Windows XP Professional x64 Edition. For more information about
the WOW64 subsystem, see the "Running 32-bit Applications" topic in the
64-Bit Windows section of the Microsoft Platform SDK documentation. To view
this document, visit the following Microsoft Web site:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/win64/win64
/running_32_bit_applications.asp
In addition, there are some differences between Itanium and x64 Edition
Versions:
1. Itanium? systems offer a highly scalable 64-bit platform that delivers
industry-leading performance for mission-critical, high-end systems.
2. Itanium? systems can run 32-bit code without recompiling, but require
hardware or software emulation for 32-bit processes. The x64 hardware can
run 32-bit operating systems in native mode without emulation.
3. Itanium? operating systems do not support multimedia features. The x64
Edition operating systems offer near-feature parity with current x86
desktop and enterprise environments.
4. Neither the Itanium? platform nor the x64 platform support 16-bit
application code.
For product information about Microsoft Windows XP Professional x64
Edition, visit the following Microsoft Web sites:
http://www.microsoft.com/windowsxp/64bit/default.mspx
Exploring Windows XP Professional x64 Edition
http://www.microsoft.com/windowsxp/using/64bit/russel_exploringx64.mspx
Overview of the compatibility considerations for 32-bit programs on 64-bit
versions of Windows Server 2003 and Windows XP
http://support.microsoft.com/kb/896456
Changes to Functionality in Microsoft Windows XP Professional x64 Edition
http://www.microsoft.com/technet/prodtechnol/winxppro/64bit/cifx64.mspx
For more information about device drivers for x64 platform, you may refer
to the following links:
http://www.planetamd64.com/
For more information about the 64-bit processor of AMD and Intel, please
refer to the links:
http://www.amd.com/us-en/Processors/ProductInformation/0,,30_118_9331,00.htm
l
http://www.intel.com/technology/64bitextensions/
Hope the information is helpful.
Thanks & Regards,
Ken Zhao
Microsoft Online Partner Support
Get Secure! - www.microsoft.com/security
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| From: "Santosh Kumar" <nospam@xxxxxxxxxx>
| Subject: Is WinXP Pro 64-Bit Edition a True 64-Bit OS?
| Date: Thu, 2 Jun 2005 21:27:53 -0700
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| Does Microsoft Windows XP Professional 64-Bit edtion support true 64-Bit
processing (i.e. utilizing the full 64-bit CPU registers for computiations)
in hardware as avaialable with the AMD Athlon64 and Opteron processors?
| Or (as alleged by Intel to me over the phone) not a true 64-Bit OS in
that it only supports 64-bit memory extensions (i.e. what Intel offers with
their EM64T) but treats a 64-Bit processor such as the AMD Athlon64 (or
even the Intel Itanaium / Intanium 2) as 32-bit processors?
| Santosh Kumar
|
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