WEI breaks down the graphical capabilities of your system into two separate sub-scores. This first sub-score (Graphics) is for desktop performance, specifically that of the Windows Aero user experience. The second graphics-based subscore (Gaming graphics) is for 3D business and gaming graphics performance.
Microsoft provides the following information about interpreting a base score: 1.0 to 1.9
- Basic performance. Even a component with a 1.0 subscore meets the Windows 7 minimum requirements. 2.0 to 2.9
- Enhanced performance. Windows Aero may be available. 3.0 to 3.9
- Windows Aero will be enabled. 4.0 to 4.9
- Good performance with high-resolution displays and multiple displays. 5.0 to 5.9
- Capable of running high-end video games, 3D modeling applications, and high-end video editing applications. 6.0 to 6.9
- Supports DirectX 10 graphics with high frame rates at high resolutions. 7.0 to 7.9
- Highest performance level available. Reserved for systems with SSD hard drive, high-end graphics card, and multi-core (i.e. 8 or more) processor.
However, WEI should not be used as a benchmarking tool because of many severe limitations. See this thread. Windows Exerience Index True?