It is backwards compatible to 10.6.8, includes NVME support and avoids some of the issues of 142.0.0.0.0. 144.0.0.0.0 is where you really want to be. So it doesn't matter if your new metal graphics card is EFI or non-EFI. The 10.13.6 firmware won't work with Mojave, but it will allow you to upgrade the firmware without any need to see the boot screen of your Mac. The upgrade for these old machines is effectively a three part trips.

If you do any video editing too, it makes FCPX & Davinci Resolve run great with an old 5,1.ġ0.13.6. It worked find with High Sierra & now with Mojave. Yeah, i just put a regular 'Sapphire pulse 8gb RX580' that I got from ebay for about £125. You will experience a black screen during the firmware upgrade process but you can check if it was successful via the system info in OSX (boot rom: 144.0.0.0.0 is what you are aiming for).Ĭan I ask what Mac OS version you were upgrading from? I thought I read that if you upgraded and previously installed High Sierra 10.13.6 (which I am on) you already had the firmware update ? Is this not the case ? If you are running a non-EFI card, just follow the instructions given by the Mojave installer. It won't update the firmware during the installation process if you try and execute the installer from a PCIe based SSD. One thing that I did discover through the process is that you need to run the OSX Mojave installer from either a USB stick or from one of the internal SATAII ports inside the 5,1 Mac Pro for it to update the firmware on the machine. It's a non-EFI card, but I'm not fussed by it as my computer stays on for weeks at a time. It has been incident free running Mojave & HDX with 2019.6. I tossed a Sapphire RX580 into my 5,1 Mac Pro a few days ago.

Mac pro metal capable gpu