Well, it is for benchmarking your computer's performance in games (mainly), and the numbers are just a scoring system. I don't know exactly what the score means in 3DMark05, but I know that like in AquaMark3 the score is directly linked to your average frames per second. It pushes your computer's graphical performance (still tests the CPU though, of course!) to the maximum and then you can compare to what other people get .