Components are rated according to their Linux compatibility.
You'll see on the site some numbers like 4.5 x 2 for rated components. This means that the mean note for the component is 4.5 and that 2 persons have noted this component.
The rating scale is the following:
|5||Works out of the box.|
|3||Works with modifications.|
|0||Don't know or not supported by hardware.|
|-5||Does not work.|