Successful update from Late 2009 Mac Pro 4.1 to High Sierra, after struggling to understand the ‘boot to recovery partition’ part (just open Terminal when you are there).
I decided to find out. UPDATE: To … Bought one of their listed "It works" cards, Sapphire Radeon Pulse RX 580. NVIDIA Kepler GPUs, like GTX 680/770/780 can be used to drive a 4K monitor on a Mac Pro 3,1 in Mojave. Stay tuned for Vega news. I have a 3,1 Mac Pro eight core with 20gb RAM and SSD boot drive with an nVidia 8800 GT card in it that I've installed High Sierra on with dosdude's patcher. Rating: 4/5 RX 580 installed to 2009 Mac Pro 4,1 March 8, 2020 Installed 10.14.6 Mojave to a new HDD, replaced OEM GPU with this RX-580, and it's working as it should - with an exception or two (which is probably why the MP 4,1 is not on OWC's compatible list). I put both of my AMD RX 580 GPUs into the Mac Pro to hopefully get higher fidelity for gaming and hardware encoding.

You'll soon be able to put the same card in your 2008-2012 Mac Pro that comes in the new $6,000.00 monster from Cupertino. Supported Systems Name Description Revision Number File Size Release Date Download Link Mac Pro (2019-2020) with Radeon Pro 580x, Radeon Pro Vega II and Radeon Pro W5700X Boot Camp Driver for Windows 10 Display Driver AMD Radeon Settings 19.40 557 MB 4/20/2020 No video at all. Whether gaming or a graphics pro - this tutorial will help you install the best Metal compatible GPU into a Classic Aluminum Mac Pro Tower 5,1 4,1 [RX 590: 12% better performance vs RX 580]. Then installed the Sapphire Radeon Pulse RX 580 with double mini 6 pin to 8 pin connector – not easy to find – and updated easily to Mojave.

The 2009 Mac Pro has two PCIe x 16 slots.
I am in process of trying to upgrade my Mid-2012 Mac Pro and Apple has been NO HELP.

Caveat #1: 3,1 will boot, it is up to you to patch SSE4 libraries, etc. Edit: The answer is that Xeon chips will not support the AMD drivers for the RX580 due to a lack of SSE4.2 instructions. The EFI works, rest up to you.

Mac mini (2018), Mac Pro (Early 2008), MacBook Pro (Retina, 15-inch, Mid 2015), GA-Z170X-Gaming 7, Sapphire Pulse Radeon RX 580 8GB GDDR5, Sonnet Echo Express III-D, Trebleet Thunderbolt 3 to NVMe M.2 case Got NO install instructions or cabling needs. Finally got the needed cables, had it installed and IT DIDN'T WORK.

Was the 2009 Mac Pro capable of housing my pretty decent and modern GPUs? Amazon couldn't even reach the maker for info.