UPDATE: Issues with Sapphire BIOS on my XFX RX480... Flashed it again using MSI RX580 bios of 1393/2000 but still get directx errors in bf1. So I downclocked it to 1366/2025. working no issues with no power bumps, power limit needed 50%. set fans to 100% but it now pulls up to 220w of power! never used to go over 150w before. I am looking for the MSI RX580 bios file default of 1366/2000 that card only has 1x8pin power which should be what rx480 users with 1x8pin power should be using... no issues or blue screens yet. just annoying directx errors in bf1 which is pr obably a driver issue. happened with rx480 but stopped after several driver updates. and VSR does not work in game or games do not detect it. I have to set my desktop resolution to what I want and set game to borderless and it will use my resolution. Also I no longer get throttling using RX580 bios. I used to throttle hard going over 150w but no more. RESULTS MAY VARY FOR EVERYONE I TAKE NO LIABILITY FOR YOU DOING THIS.... every mobo and chipset and processor and ram may not react the same to the rx580 and new drivers are needed.....

So, i flashed my rx 470 4gb (XFX) to rx 570 (gygabyte) and everything works but, now is slower :s3d: why? i dont know i also tested some games like tomb raider and far cry primal and it runs slower in all of them, it runs like when the power efficiency switch is on but is missing in the radeon settings, if i go back to rx 470 the switch reapers so this is very strange. btw. im using the latest drivers 17.4.3 Check the results: Rx 570 bios (gigabyte) https://drive.google.com/open?id=0B11y4b8Rl-MQRkxhemVIam9WcjQ Rx 470 bios (xfx)https://drive.google.com/open?id=0B11y4b8Rl-MQNGNHUnZWMkhsNDA

Maybe there is throttling caused by the different power and fan profile. If your xfx is the single fan version with a 6-pin connector while the gigabyte is the two fans gaming version with 8-pin connector, then are quite different cards, with a small frequency difference too. Have you monitored the cards during the benchmarks to see their frequencies?

I flashed" Asus RX 580 8 GB 2017-03-01 03:01:00 015.050.000.001.000000 PCI-E 1360 / 2000 I found the most stable for my card is 1366/2025 So I use the 1360 Asus BIOS and use Afterburner to set to 1366 / 2025 with a +50 Power Limit. No issues and no more throttling.. very happy. using rx580 drivers 17.4.4