winSAT.exe is the Windows System Assessment Tool. It collects information about the processor, memory, 2D graphics, 3D graphics, disk et al in the computer, and then, based on an algorithm, it calculates a score which is the famous Windows Experience Index score. Problem is, every week this Windows performance assessment tool is launched and uses up way to much of the computer’s available resources.
For Vista, 7, and 8 the WEI score can range from 1.0 to 5.9. The basic idea was to give gamers something to compete with. Even Microsoft insists that people don’t run and publish performance testing results as the test is not an accurate or fair measure. If you know how, this WEI score can easily be manipulated anyway.
The tool has been reported by many oveclockers that any sort of overclock will confuse the Windows performance assessment tool. The consequence is that any game or other resource intense process could seriously stutter or worse, crash.
In my opinion, this automated scheduled process should be disabled no matter what (you can still run the rating tool manually by CLI.
Best way to disable it is by using the task scheduler:
1. Go to Task Scheduler. (one way is; windowsbutton+R, and enter “%windir%\system32\taskschd.msc”)
2. Browse to Microsoft\Windows\Maintenance.
3. Disable the task named “WinSAT”.