I was reading on Martins review that 1200 is the minimum, so that looks good.
Also, Martin states the pump was inaudible up to 65% and if I turn mine above 3% it's quite audible, and that's with the case under my desk.
I'll take a video in the morning and try to isolate the noise. Maybe I'm just not used to water cooling/pump noise. I don't think it's faulty.
It's probably user error.
My Antec Kuhler 620 was inaudible on any setting, so it seems odd that at minimum speed the pump is humming/buzzing this much. I wouldn't be surprised if I screwed something up.