Windows Experience Index scores in Windows 8.1

Step1 :
Open a cmd and type "winsat prepop"
This will run the benchmark and store the results on your PC as XML files.
Step2 :
 Open the Windows Powershell and type "Get-WmiObject -Class Win32_WinSAT"

WinSPRLevel : is the base score and is  the lowest of the scores and represents the Rating in windows 7

The maximum score is 7.9