I believe that command will only assess the performance of the graphics card, and its relation to directx.
There are several other Command line choices:
winsat dwm Assesses the ability of a system to display the Aero desktop effects.
winsat d3d Assesses the ability of a system to run Direct 3D applications, such as games.
winsat mem Assesses system memory bandwidth by simulating large memory to memory buffer copies.
winsat disk Assesses the performance of disk drives.
winsat cpu Assesses the performance of the CPU(s).
winsat media Assesses the performance of video encoding and decoding (playback) using the Direct Show framework.
winsat mfmedia Assesses the performance of video decoding (playback) using the Media Foundation framework.
winsat features Enumerates relevant system information.
winsat formal Runs a set of pre-defined assessments and saves the data in an XML file in %systemroot%\performance\winsat\datastore.
It is not always necessary to resort to command prompts in Windows. It has been designed as a user friendly GUI and there are often mouse click ways to achieve some results.
For example, to gain more insight into the performance index , you can do this
From the Control Panel, find Performance Information and Tools (or type it into the Search pane from the Start orb). In the Tasks pane, (on the left) you can select Advanced Tools. You'll notice a bunch of different tools. Locate the \"Generate a system health report\" tool. Wait one minute while the test runs and you'll get a nicely detailed report.