The sapphire cooler is actually quite remarkable to be honest. In a single card setup, I leave my 7850 at 20% fan speed all the time, including games, and I rarely went past 70 degrees celcius. It is silent up to 40%, at which cooling performance is more than enough. 20% fan speed was enough for me 24/7. I also live in Australia which has an ambient currently at around 35 degrees celcius, so results are inflated somewhat.