There are two black box systems and one red box.
1)Old style black box with vacuum module mounted next to it, max 10,300(aprox).
2)Newer style black box 9900 ropm(approx)
3)Red box system 10,300-10,500 (approx)
The 9900 system is a rookie system, there are situations you need the extra 300-500 rpm to bury the car in the corner, yes the band peaks at about 8500-9000 rpm, but you have to carry the momentum further, and if you gear the car to run out of gear 9300 rpm at the end of the straight you will lose too much bottom end (off the corner), generally off the corner is where you gain momentum to pass. You really need to use all you can get, especially on short tracks.