The Tests:

  

2D Tests - 3D Tests - Bus Transfer Rate - AGP - Other
2D tests measure your machine's raw CPU performance and memory speed.

3D tests concentrate on your 3D accelerator. The speed of the CPU is also a major player in these tests.

Bus Transfer Rate measures your computers ability to send data to your video and 3D acceleration cards.

The AGP test measures the performance of of your AGP (Advanced Graphics Port), if you're lucky enough to have one.

And finally, the Other section has all the parts of Final Reality that do not actually measure anything, but look very cool.