Graphics card to run Mojave on Mac Pro 5,1

Yess... i bought a sapphire mac version radeon 7950 way way back when... and it works fine... but for installing sierra, high sierra and mojave, the switch on the card has to be in the other position( yes, there’s a 2 position switch on the card) otherwise it will not boot and won’t install sierra, high sierra or mojave. You will see nothing on the screen at all. About the only other choice might be the nvidia 680?? As for replacing files to get your 7850 working, try xlr8yourmac.com or tonymacx86.com for some rough ideas. Usually a pc grafix card may work in a mac pro— with the following conditions: you will not see a boot screen until the grafix drivers have been loaded. So if you need that for troubleshooting, u r out of luck. A pc grafix card may be flashed to work on mac, but this costs money. The 7950 new is around $ 300. Way way back when, i paid about $740 with shipping. That card is old by now but it still works. Talk to someone else, i have no real idea on which files to replace to get the 7850 working legit. Maybe someone else has already figured it out or fixed it so it does work.

john b

The Nvidia GeForce GTX 680 works in Mojave, I have one, as it is an older card the Nvidia drivers are built in, it is only newer Nvidia cards that have the problem with drivers and Mojave.

Go search macrumors web pages.

There have been more posts there about MacPro 5,1 users upgrading their machines to get to Mojave.

Much of the problems with the older cards is that the card makers do not want to rewrite their drivers for Mojave.

Can't blame them. They want to focus their money and efforts on new cards and new PCs.

There's a complete rundown here

https://blog.greggant.com/posts/2018/05/07/definitive-mac-pro-upgrade-guide.html