Guys, you are all mistaken about the fans, no matter what fan you put infront of the 650d or 600t it will make noise, its just the way the honeycomb is made, its weird and makes alot of turbulence noise, i mean i put a noctua nd-p14-flx 140mm with the ultra low noise adapter and i still get noise, what ive seen people do is just take a dremmel and cut out the honeycomb and all your noise problems will be over.