Seem they are talking 2 stories. 
Sticky thread on Corsair forum:

Sticky thread on Corsair forum:
http://forum.corsair.com/v3/showthread.php?t=107252RAM GUY
Corsair Product Guru
Default H60 / H80 / H100 “Buzzing” or “Grinding
Corsair is aware that some number customers are experiencing a “grinding” or “buzzing” noise when using some of our Hydro Series coolers (specifically H60, H80, and H100). This does not affect every unit and has been very difficult to track down. After extensive lab testing, we’ve been able to re-create the issue on a small number of units in certain situations. We are working on a root cause analysis and will have a solution shortly.
In the meantime, rest assured we are aware of the issue and will post a solution here. Corsair is dedicated to ensuring the highest possible customer satisfaction, and we appreciate your patience with this problem. As mentioned, now that we have recreated the issue in a lab environment, we can work on a fix and provide it to you once it’s been verified ready for production.



