Ok, the card runs on my MacPro 2010 - but only with a single monitor, with two monitors connected nothing works. I also miss the BIOS switch on my card. Where should I find it? Did I receive the wrong card?

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MacOS supports the 580 chips. However, the RX580 from Apple has a customised firmware. But the purchased one does not, no boot logo, etc.... The button is on the right side of the card on the board and is very small.

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Question about Sapphire Radeon RX 580 Pulse

Ok, the card runs on my MacPro 2010 - but only with a single monitor, with two monitors connected nothing works. I also miss the BIOS switch on my card. Where should I find it? Did I receive the wrong card?