I currently am using the H240x Swiftech liquid cooling for my CPU (4790k Stock clock). I can have the fans be completely silent because of how effective the cooler is which is pretty great. The main issue is the minimum RPM for the pump is high enough that at idle it is currently the loudest thing in my system. I had my eye on more effective air coolers so I might be able to cut out that pump noise, but am worried that I will need to pump the fan speed up and end up with no gain from switching. I would end up getting the biggest monster I could find (Noctua NH-D14 Heatsink is my current target) to let it stay as quiet as possible, but would like some outside opinions.