Temperature does not rise above 75 ° even torturing the CPU with the "Maximum" mode IntelBurnTest. (4770k @ 1.16V - yes it is the voltage that account for temperature, not the frequency!) To compare HWMonitor showed me more than 90 ° on the same test in "High" mode with a Cooler Master 212 Evo - rather creepy. I replaced the original 2 Artic Cooling fan F12 and frankly inaudible pump.
Easy installation, it is strongly recommended to install the input fans. I can only advise, except perhaps the original fan very noisy (but powerful).