The Radeon RX 5700 XT was tested it last autumn:
https://barefeats.com/cmp-5700-xt-vs-other-gpus.html
hint: This is an opened door for the Mac OS Big Sur.
REPORT:
Sapphire Pulse Radeon RX 5700 XT 8GB GDDR6
This card is PC AND MAC compatible by default, no need to flash it.
I bought mine here:
https://eshop.macsales.com/item/Sapphire/112930120G/
REQUIRE: Catalina 10.15.1 installed on your Mac Pro 5.1 only, with OpenCore or Clover.
This guide explains how to use the excellent OpenCore boot loader to install, run, and update the latest version of macOS on the MacPro5,1, resulting in a clean, unaltered operating system just like on a supported Mac.
forums.macrumors.com
*(use OpenCore by default, PART I, no need to follow Part II Advanced Configuration - at your own risks)
Performance: equivalent to the VEGA 64, BUT... no need to flash, and has boot screen
Power Consumption: dual 6 pins to 8 pins,
plus dual sata 15pins to 6 pins. *see below for config
Outs: 1 x HDMI, 3 x DisplayPort 1.4
Compatibility: DirectX 12.0, OpenGL 4.6, Metal Supported, feature set macOS GPUFamily2 v1, macOS 10.15.1 Catalina or later required
Other: occupies 2 slots, with Boot Screen
ALERT: Don't go with the MacVidCards version "right now"... they are flashing it - don't know why, though... and their flashed version is not compatible with the latest OS, they announced it on their official site, to keep OSX 10.15.4 ...
http://www.macvidcards.com/blog/dont-update-to-10155-with-efi-5700
I have the OWC version of Sapphire Pulse Radeon RX 5700 XT 8GB GDDR6, and even if it's a PCIe 4.0 card, it fits perfectly within the Mac Pro, power and data wise.
IF you have no need for the #3 and #4 Dock slots, use my trick instead of tweaking your Mac Pro with the PIXLAS mod...
Power consumption: 6 + 8 Pins: dual mini 6 pins to 8 pins, PLUS dual SATA to 6 pins. NO PIXLAS mod. This situation is for the MacPro 5.1, because the 7.1 has a different power manager.
- 18AWG Dual Mini 6 Pin to 8 Pin Male PCI-E Power Cord, 8$US at newegg.com
- Dual SATA 15Pin Male M to PCI-e 6 Pin Female F, 9$US at newegg.com, plug them in #3 and #4
- StarTech.com PCIEPOWEXT 8 in. 6 pin PCI Express Power Extension, 10$US at newegg.com to extend the Dual SATA, because it's not long enough..
Oh, btw, I bought that card because my RX 570*(no flash, no boot) was **** with the game RUST... now I see everything in 8k, imagine the beauty!
My System Report *(with 2 monitors, and NightShift works by default when set with kext in OpenCore):
Hardware Overview:
Model Name: Mac Pro
Model Identifier: MacPro5,1
Processor Name: 6-Core Intel Xeon
Processor Speed: 3.46 GHz
Number of Processors: 2
Total Number of Cores: 12
L2 Cache (per Core): 256 KB
L3 Cache (per Processor): 12 MB
Hyper-Threading Technology: Enabled
Memory: 48 GB
Boot ROM Version: 144.0.0.0.0
SMC Version (system): 1.39f11
SMC Version (processor tray): 1.39f11
Serial Number (system): C07L30L3F4MH
Radeon RX 5700 XT:
Chipset Model: Radeon RX 5700 XT
Type: GPU
Bus: PCIe
Slot: Slot-1
PCIe Lane Width: x16
VRAM (Total): 8 GB
Vendor: AMD (0x1002)
Device ID: 0x731f
Revision ID: 0x00c1
ROM Revision: 113-1E4112U-O45
Metal: Supported, feature set macOS GPUFamily2 v1
Displays:
24MP56:
Resolution: 1920 x 1080 (1080p FHD - Full High Definition)
UI Looks like: 1920 x 1080 @ 60 Hz
Framebuffer Depth: 30-Bit Color (ARGB2101010)
Display Serial Number:
Main Display: Yes
Mirror: Off
Online: Yes
Rotation: Supported
Automatically Adjust Brightness: No
24MP56:
Resolution: 1920 x 1080 (1080p FHD - Full High Definition)
UI Looks like: 1920 x 1080 @ 60 Hz
Framebuffer Depth: 30-Bit Color (ARGB2101010)
Display Serial Number:
Mirror: Off
Online: Yes
Rotation: Supported
Automatically Adjust Brightness: No
