Hi folks I hope I am posting this in the right category. I recenly fished out my old mid 2012 mac pro from the cupboard which I haven't used for a couple of years with the intention of upgrading it so I can use an OS which is newer than High Sierra by installing a metal graphics processor. I picked up a used Sapphire Pulse Radeon RX580 8GB which Apple recommend as a plug and play solution and should be capable of running Sequoia. I got it installed OK but obviously it wont connect to my 27"...

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