My PC was running a little too warm for 4.8Ghz so I bought a new Corsair H100 watercooler and a new door for the 600T with 4 ultra quiet fans. Seems to be a lot better now. Although I can't max the fan power on the H100 because they are stupidly loud, so it's on it's lowest settings. I've set the H100 fans to Pull, as there is lots of cold air coming from inside now. It's a shame the 600T gives no room for push/pull or to mount the fans inside.