Just redid my build using the new iCue Link hub and the QX fans, and I'm noticing that the fans ramp up and down to an extreme level, often going from zero rpm to max and back to zero in a matter of seconds. The coolant temps are not fluctuating, and the fans not set on the Hydro X profile are behaving normally. Does the Hydro X profile for the QX series fans pull from the CPU temp instead of coolant temps now? That seems wildly different from the previous Hydro X profiles.
EDIT: I also noticed the pump is behaving the same way - ramping up from 2000 rpm to 3300 if the CPU temp spikes instead of basing it on the fluid temps.