I no happy right now.. my pump started making a huge buzzing noise and corsair wants it back... F@k im at stock now....
Did you try rapping on it with a pencil while it's running? That buzz generally comes from built up air being trapped. And generally cause it's not in an optimal setup. Not that you're guilty of tha... ( maybe I should try another word)... not that you did that. Just that sometimes if the Radiator or the pump are inverted in a negative manner air gets cycled through the system and into a spot where it can become tapped causing cavitation and then build up. I help a guy a long while back fix his issue w/o having to go the RMA route by having him rap on it with a pencil.
You might try it if it isn't gone already. Couldn't hurt anyway.