Hi all, I've got the same issue. One of the cooling fans of my ASUS DUAL RX 580 went down. I ordered a replacement, it was offered as "more powerful", so I went for it. It was 0.55A compared with 0.25A of the standard one. When I replaced the fan (I've tried replacing just one fan or both) the card was working at first but as soon as I start mining it crashes after a few seconds.
Is there any way to adjust settings - either OC or BIOS - to fix this? Or 0.55A fans just won't work here?
You can connect these units from the main power supply, and use a resistor to adjust the speed.
I also have problems with fans on ASUS video cards. I turn off the main cooling system and attach the usual 80x80 or 90x90 fans to the top.
The only drawback is the noise.