Summary: I've never been sensitive to fan noise but I don't like how Corsair rigged this fan. It's off at low load but moderate to high loads it spins up way more than necessary. There is no switch to control the fan. Add one of those and this would be a great PS.
Pros: Cheap for wattage, modular, Corsair has a good PSU reputation. No coil whine on mine. Appeared brand new, not a scratch on it, no dust.
Cons: Fan goes from 0 to 100 at moderate to high loads. Eventually spins down but is still loud. My test was with one 290, three hours of gaming, no headphones, case ~4 feet away.
Summary: i bought the corsair hx1050 80+ gold to power x2 gtx 780's in sli and my i7 2600k . i only had this power supply for one week before i returned it . the reason i returned it was because when ever i was gaming it got very loud it got so loud that i was scared some thing was wrong with it .
Summary: ... I've tried to turn my new Radeon 7970 on by using the optional cables (modular) that came with this PSU. I had to skip using this cables and used the ones that are attached in the PSU, and only after that my 7970 worked.