They talk about alt RPM on chart. The alt came with the small pulley, so is about make the maths to know what crank pulley they used.

About make comparison between alts, thats at each own depending on your car requirements, my goal here is just tell the high output alts no matter how much won't hurt our stock systems just because the output by itself. You can fit a 2000 thousands amp alts but if your car just sucks out 40, thats what the 2000 amps alt will provide.

Amperes are not pushed in, but sucked out

A woman can get giant milky boobs, but the baby won't suck out more than he needs untill gets full. And the boobs could still be full of milk after that