If you want to configure your own fan profile, it is important to know how efficient the cooler is. You obviously want as much cooling as possible with low noise levels. To test this we measure with what fan profile the card is as close to 40 dB(A) as possible. After that we run 3DMark Fire Strike Extreme for 10 minutes and measure the maximum temperature of the card. For this we turn the temperature limit off, because this could affect the test results.
This is only an indication, meant to make it easier to compare the graphics cards. We run the tests on a test bench, meaning that the card could be cooler than when it is in a regular case. Based on this you should not expect to have the same results in terms of noise levels and cooling.
Looking purely at the capacity of the cooler, mainly ASUS and MSI perform well. The cooler of the ASUS RX 580 Strix Top clearly had the biggest potential - it is a shame that the manufacturer set such an agressive fan profile, otherwise it could have definitely been the quietest. The Gigabyte cooler is less efficient and the Sapphire coolers are at the bottom of the graph, which we more or less expected because of their cooling and noise levels.