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{{redirect|Windows Experience|the version of Microsoft Windows|Windows XP}}
{{Use mdy dates|date=March 2015}}
{{Infobox software
| name = WinSAT
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The '''Windows System Assessment Tool''' ('''WinSAT''') is a module of [[Microsoft
The WEI enables users to match their computer hardware performance with the performance requirements of software. For example, the [[Windows Aero|Aero]] [[graphical user interface]] will not automatically be enabled unless the system has a WEI score of 3 or higher.<ref>{{cite web |title=Full screen previews have got disabled. How do I re-enable them? |url=http://answers.microsoft.com/en-us/windows/forum/windows_7-desktop/full-screen-previews-have-got-disabled-how-do-i-re/d44193c0-7e51-4a2f-8ec0-4ac115c710c0 |publisher=Microsoft |access-date=June 3, 2011}}</ref><ref>{{cite web |title=What Is the Windows Experience Index |url=http://windows.microsoft.com/en-US/windows-vista/What-is-the-Windows-Experience-Index |publisher=Microsoft |access-date=June 3, 2011}}</ref>
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The WEI can also be used to show which part of a system would be expected to provide the greatest increase in performance when upgraded. For example, a computer with the lowest subscore being its memory, would benefit more from a [[RAM]] upgrade than adding a faster hard drive (or any other component).<ref name="Microsoft_Perfect_Score"/>
Detailed raw performance information, like actual disk bandwidth, can be obtained by invoking <code>winsat</code> from the command line. This also allows only specific tests to be re-run.<ref>[http://windowsitpro.com/systems-management/winsat-command-line-utility Winsat Command-Line Utility]</ref> Obtaining the WEI score from the command line is done invoking <code>winsat formal</code>, which also updates the value stored in <code>%systemroot%\Performance\WinSAT\DataStore</code>.<ref>[http://windowsitpro.com/systems-management/how-can-i-run-windows-system-assessment-tool-winsat-update-directly-command-line How can I run the Windows System Assessment Tool (WinSAT) update directly from a command line?]</ref> (The XML files stored there can be easily hacked to report fake performance values.<ref>[http://www.howtogeek.com/71500/stupid-geek-tricks-hacking-the-windows-experience-index/ Stupid Geek Tricks: Hacking the Windows Experience Index]</ref>) The WEI is also available to applications through an [[API]], so they can configure themselves as a function of hardware performance, taking advantage of its capabilities without becoming unacceptably slow.<ref>{{cite web |title=Windows Experience Index: Overview |date=July 10, 2009 |url=https://technet.microsoft.com/en-us/library/cc507870.aspx |publisher=Microsoft TechNet |access-date=September 24, 2011}}</ref>
The Windows Experience Index score is not displayed in [[Windows 8.1]] and onwards because the [[graphical user interface]] for WinSAT was removed in these versions of Windows, although the [[command line]] winsat tool still exists and operates correctly along with a final score when launching the command "shell:games".<ref name="WEI killed">{{cite web| url=http://www.cnet.com/how-to/find-your-windows-experience-index-scores-in-windows-8-1/| title=Find your Windows Experience Index scores in Windows 8.1 | author = Ed Rhee |
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Preliminary design elements created for Microsoft by Robert Stein in 2004 suggest that WinSAT was intended to rate a user's hardware during the [[out-of-box experience]];<ref name="Stein">{{cite web |url=https://www.flickr.com/photos/rs3art/304021764/in/set-72157594393542938 |title=Aurora for OOBE |last=Stein |first=Robert |work=[[Flickr]] |date=November 22, 2006 |access-date=April 18, 2015}}</ref> this is a design decision that would be retained for the operating system's [[release to manufacturing]].<ref name="WinSAT2006">{{cite web |url=http://download.microsoft.com/download/5/b/9/5b97017b-e28a-4bae-ba48-174cf47d23cd/cpa101_wh06.ppt |title=Windows Vista System Requirements and WinSAT |last=Russell |first=Richard |date=2006 |publisher=[[Microsoft]] |format=PPT |access-date=April 18, 2015}}</ref>
During the [[Windows Hardware Engineering Conference]] of 2005, Microsoft formally unveiled the existence of WinSAT and presented it as a technology not only for games, but one that would allow Windows Vista to make decisions, such as whether to enable [[compositing window manager|desktop composition]], based on a machine's hardware capabilities.<ref name="LongShort">{{cite web |url=http://www.techrepublic.com/article/the-long-and-short-of-longhorns-hardware-requirements/ |title=The long and short of Longhorn's hardware requirements |last=Shultz |first=Greg |date=June 30, 2005 |publisher=[[CBS Interactive]] |work=[[TechRepublic]] |access-date=April 18, 2015}}</ref><ref name="Muench">{{cite web |url=http://blogs.msdn.com/b/mikehall/archive/2005/04/26/412402.aspx |title=WinHEC : Chris Muench Report for Day 2 - Everything has two sides |last=Muench |first=Chris |date=April 26, 2005 |publisher=[[Microsoft]] |work=MSDN Blogs |access-date=April 18, 2015}}</ref><ref name="WinSAT2005">{{cite web |url=http://download.microsoft.com/download/9/8/f/98f3fe47-dfc3-4e74-92a3-088782200fe7/TWAR05002_WinHEC05.ppt |title=System Performance Assessment Tools for Windows 'Longhorn' |last=Russell |first=Richard |date=2005 |publisher=[[Microsoft]] |format=PPT |access-date=April 18, 2015 |archive-date=November 5, 2015 |archive-url=https://web.archive.org/web/20151105224141/http://download.microsoft.com/download/9/8/f/98f3fe47-dfc3-4e74-92a3-088782200fe7/TWAR05002_WinHEC05.ppt |url-status=dead }}</ref> WinSAT would remain a key focus throughout development of the operating system before its release to manufacturing.<ref name="WinSAT2006"/>
==Tests==
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