Dangle_kt,

That seems really high, though I don't know what you are building.

I am guessing that you chose the HP model "just to be sure". The HP model is important for "high speed-high power" applications like pumps and fans where the load never gets easier to move. In other words, thanks to Newton, we know that it takes the most torque to get a mass moving from a standstill up to a constant velocity (this is all about peak torque requirements, not power). Once you get to that constant velocity, it gets much easier to maintain that velocity. Deceleration will require more torque than running at constant velocity, but less torque than the acceleration phase because friction helps you slow down.

if you want the high resolution of the HP (6,400 cnts/rev) but don't need the extra power, you can order the SDSK with the -E option (the default -R option is 800 cnts/rev).

Running a pump at high speed with a viscous load that never gets easier to move requires higher power than an inertial type load, like a gantry. We just don't want you to spend more money than necessary to achieve your expected results.