My understanding is that power input and PWM are different on the D5. PWM should just control the power output of the pump, and the purpose of it is to reduce power output. As for why PWM: you don't necessarily want the pump running full-steam all the time, especially with the computer at-or-near idle. I think there fluidics reasons for slowing the pump down, but my main concerns are noise and pump wear.
3/20/17 at 10:29am