My H110 pump is buzzing louder than anything in the case. Its considerably louder than the H80i I upraded from. I upgraded for the soul purpose of quieting down my system at all loud levels. It is quieter on load but much louder at idle because of the pump buzzing. I have tried:
RMAing the pump, no difference.
Disabling speed control on the fan header.
Checking to make sure its running at 1500RPM at all times.
Disabling all fans to make sure its the pump.
I could try and put the pump on a header than can control the voltage but I heard thats unhealthy for it.
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h110 pump buzz