Hmm. Someone else had pointed those out in this forum in the last couple weeks, I think. They looked promising.
Well, Sah! Those are going to each generate 35 dBA at full bore. I think you should describe the noise at high RPM. Is it "fan-motor" whine or vibration?
It is possible to make a decent fan better. First, you could pull the labels from the motor-housing (careful not to damage them - if ever you want to RMA). There may be a rubber-grommet beneath the label, so you'd pull it out, add some Teflon gun-grease, and then replace everything. A dab of rubber cement on the label should put it back the way it was.
Then again, you are using the H80i AiO water-cooler, and these fans you would have applied to the radiator. Right away, I sense a possibility that you didn't take care to do what only some in the enthusiast community might bother to do: completely isolate the fan from any (ANY!) contact with the metal of a radiator, case or side-panel.
Depending on the mounts provided by the Corsair H80 -- likely just holes in metal tabs [Oh, hell . . . . lemme look . . . jus' a minute . . ] . . . Oh, yeah . . . OK . . .
Get some of these:
http://www.sidewindercomputers.com/setof4rufanr.html
or these:
http://www.sidewindercomputers.com/setof4fanrid.html
I suppose you could further deaden noise transmission by installing small pieces of Spire foam rubber between the radiator and case, or cut a "washer" or grommet for it -- this would depend on your own inspection of how the H80 is installed, or how you might benefit from this "last grain of rice."