Sure, as long as the OS has drivers for the card. As I posted I'm running a Gigabyte RX6800XT.
The 7,1 NcMP has internal plugs to power the cables needed to run the cards. You will also need cables:
Auxiliary power cables for 2019 Mac Pro. For use with Sonnet AMDRadeon RX 6800 XT and 6900 XT graphics cards.
www.sonnetstore.com
https://www.apple.com/shop/product/HQY92ZM/A/belkin-aux-power-cable-kit-for-mac-pro
Lou
I was confused about that. I went to the Euro site for Macvideocards, and did not see any cards for 7,1 machines. I guess the reason why is they are unnecessary? But I do not recall Apple saying one can use - for instance - a Gigabyte RX6800XT.
When Apple switched to Metal, they specified a few third party cards (such as the Sapphire RX 580) on their support pages. Because I could not find Apple specifying which 3rd party cards will work in the 7,1 (as they did in the CMP 5,1), I just presumed I would have to flash 3rd party cards in Windows, or buy a flashed card from macvidcards or someone like that.
The 7,1 still tempts me because of drive flexibility and also I have a Highpoint SD7101A-1 RAID card in my MCP. The main issue though is I feel if I bought a 7,1, besides the second hand risk, I'd end up in Windows in a few years due to Apple stopping support for the 7,1. While if I wait for an M4 Studio it will be supported for a long time IMO. The irony with Apple's Studio is they still sell only M2 versions, which will have two years less support IMO than the M4, or maybe even 3 years less support.