Thanks for the heads up guys!

I'll be using the UC300ETH-Max, (UB-1+UD-1).

I'm retrofitting an older machine, and want to keep the performance.
So I want to keep 12000mm/min on the 4010 ballscrews, so 1200rpm on the servos.

(1200rpm x 10'000ppr) / 60sec = 200khz.

So if the 400khz was max combined, it would slow my total down, but since it is per axis, it is no problem.