
MSI Gaming Radeon RX 560 128-bit 4GB GDRR5."These specific third-party graphics cards are Metal-capable and compatible with macOS Mojave on Mac Pro (Mid 2010) and Mac Pro (Mid 2012): Also don't forget that firmware updates won't work if your startup disk is a RAID drive, so use an onboard SATA boot drive for updates/upgrades. 24th, 2018 Apple released MacOS Mojave and posted a new support article Install macOS 10.14 Mojave on Mac Pro (Mid 2010 and Mid 2012), that mentions having macOS 10.13.6 installed first, (without FileVault enabled) and a list of compatible graphics cards, with a note about no startup video displayed from some 3rd party graphics cards (i.e. See Apple's article on Using an external graphics processor with your Mac that lists supported Thunderbolt 3 chassis & graphics cards.) (Also some macOS upgrade/installers (like High Sierra) required an OEM Mac graphics card installed, so keep your original Mac card on hand.) The Sapphire Pulse Radeon RX 580 is also one of the recommended models for use as an eGPU with macOS 10.13.4 (or later). It's good to have a second card like an OEM Mac Nvidia GT120 that uses no Aux power. (You could select a different Startup Disk in macOS, but IIRC only 10.12.6 and later have native driver support for RX 580.) Check your RX580 card for the required power cable - most need a Dual 6-pin (for Mac Pro connectors) to 8-pin (video card connector) power cable. For instance if booting with Option key to select startup disc. ( Since these are retail cards (not flashed with mac rom), there's no boot screen until the OS/driver loads. (The earlier reports are with macOS Sierra/High Sierra.) Reports on Sapphire Radeon RX 580 8GB in Mac Pros (macOS 10.14.x, 10.13.x, 10.12.6)Īdded macOS 10.14 Mojave reports below. Note: 6 years old iMac has no business to install Mojave.Mac Upgrades/Mods | Storage | Video | Audio/Home Theater | macOS Updates/Tips/WiFi You still can install windows with Parallel if required. It could be that particular model hardware no longer supported it. I am pretty sure none of the "many people you know who have Macs" have that particular model with that particular HDD. So not exactly as you claimed that it happened on most Macs. I am pretty sure this only happen on 2012 27" iMac model with 3TB hard drive installed and an existing Boot Camp partition.

This alert appears only on 27-inch iMacs from late 2012 with 3TB hard drives installed and an existing Boot Camp partition. Not very Apple-like as far as non-solutions go. pretty bad. I know of too many people who have Macs because they took a chance, but having Windows available to use was what won them over.
