Some Information.
I plugged both a Radeon VII and an RX 5700 XT on the motherboard: System info show both use x16 PCIe
I made several quick tests with DAVINCI and the "candle project"
Display is 3440x1440 via DP
View attachment 434216
What I learn :
1 - RX 5700 XT in a little less powerful than Radeon VII ➧ RX 5700 XT has better price/performance ratio
2 - OpenCl is dead .... slow
3 - Pluging the display on computing GPU has a minor impact on performances (It's not true with RED RAW GPU debayering for example)
4 - I can't figure how Final Cut Pro 10.4.7 select the GPU despite the new preference menu
5 - RX 5700 XT (Gigabyte Gaming OC) is less noisy than the Radeon VII when fully loaded
6 - RX 5700 XT (Gigabyte Gaming OC) is a little wider than 2 PCI slot ➧ multiple GPU difficulties
After I Superscale (very GPU intensive) the media to 8K and make the project to 8K, to find a if the RADEON VII's 16G is an advantage. 2 TNR Test give the same result with each computing GPU
Hope this helps