I don't have any H100 coolers (I do believe it's just a joke comparing to a good custom made H2O) but newermind.
I guess that pump of this cooler is connected as a fan, and you probably like to connect it to CPU fan pin.
The trick is that on RIVE, CPU (and optional CPU) fan pins are using qfan (or something alike) and this crap couldn't be disabled (at least I wasn't able to do it).
I have disabled qfan in BIOS but my pump does around 1600rpm while connected to CPU fan pin and around 2100rpm while connected to chassis fan pin.
Also with my custom H2O I have my 3930k's (4.6 v1.37) hottest core's temp under LinX test is 62C (25C ambient):D