I have been running two computers 24/7 for the last seven days, one with an NH-D14 and the other with an h20 620. The H20 has a max temp over the last week, running 100% load, of 58C. and is currently at 50C. This is on a Q6600 with a small overclock running push/pull with cheap cooler master fans. The NH-D14 has a max temp over the last week, running 100% load, of 61C. and is currently at 55C. This is on a 2600K running at stock speed with the ultra low noise adapters on the fans. The computers are in the same room running right next to each other. I know the heat output of the different CPU's is not comparable but I think this shows how well the H20 620 performs for the price.