Noise levels and temperatures
All of the tested models of the Radeon RX 570 and RX 580 are completely silent in idle, because the fans only start spinning when the graphics cards are under load.
With the noise levels under load there are big differences. The ASUS Strix-cards are not the quitest and especially the 570 Strix OC and 580 Strix Top are pretty noisy. The MSI RX 580 Gaming X is not exactly quiet either. The 570-variant and the 580 Gaming X+ are rather silent, and the Gigabyte-cards produce little noise as well. The Sapphire cards are not extraordinarily quiet, but also not noisy.
Looking at the temperatures, a few things in the above graph are explained. The ASUS RX 580 Strix Top remains very cool, which as we have seen has its impact on the noise levels. Note that the Gigabyte and Sapphire cards become rather hot - in our opinion not too much, but still hotter than the others. Gigabyte makes up for this by being very quiet, but the Sapphire cards were not the best in that regard either. This does not promise much for the cooling efficiency of those cards, that we will cover on the next page.