I know that the fans in 550D do generate a decent amount of noise, and so do the stock H100i fans, i think like 37DBA if I'm not mistaken. But no doubt, those reference 570s must be loud, if you're going for the red/black colour scheme then go for the Asus card, I've heard it's pretty quiet. I would recommend switching out your case and radiator fans in the future though, that is if you want a totally silent PC.