Windows System Assessment Tool (WinSAT) is the codename for the automatic system optimizer/tweaker built into the Ultimate edition of Microsoft's upcoming operating system, Windows Vista, as well as Windows Server codename "Longhorn".
WinSAT works by running a series of tests, and giving each section a rating (see screenshot). It then uses a "special algorithm" (not a direct average) to determine the system's overall "Windows Experience Index." Higher numbers reflect a better overall level of performance.
The scores are then used to automatically modify the system configuration, so users can get the most "bang for their buck." However, the tool may disable certain OS features if the score is "too low". For example, Aero Glass' translucency and blurring features will not function without a high enough WinSAT score.
Besides tweaking the OS (operating system), WinSAT may be used by 3rd party applications to determine their own optimal configuration. It can instruct applications to activate, change their own configurations, or shut themselves down, in order to optimize them for your specific hardware. For example, a computer game may ask WinSAT for a system evaluation, and, depending on the results, turn off unnecessary features during gameplay, thus increasing overall performance.
Users can also use WinSAT's rating to find software that will fit their system performance-wise.
Power users can also use WinSAT to determine both software and hardware bottlenecks, so they can improve their system score by removing slow boot up programs or drivers, or simply by buying better hardware to boost their lowest-scoring test.
Tests
Here is the list of tests performed by the Windows Vista Beta 2 version of WinSAT. None result in any on-screen things to watch, apart from a progress bar and a "working" background animation. Note that Aero Glass will deactivate while the tests are running, likely because it uses a significant percentage of CPU cycles on slower machines even while they are idle.
- Aero Assessment
This, presumably, is the test that determines whether or not Aero glass can be used. It probably contributes to the "Graphics" rating.
- Direct3D Alpha Blending Assessment
- Direct3D Texture Load Assessment
- Direct3D ALU Assessment
These all likely contribute to "Gaming graphics" rating.
- Windows Media Playback
Probably "graphics" rating. This probably assesses the ability of your machine to play video.
- CPU Performance
- Memory Performance
- Disk Performance
These are all quick tests that contribute to their respective categories.