Dewdman42
Senior Member
There are two separates issues.
However when you boot up, you will see a black screen until just before the desktop comes up.. as is the case with Mojave as well.
But #2 is the issue. The High Sierra installer performs a firmware update from the boot screen (which the RX580 does not provide). Its during that firmware update (which is not in OSX, its in the boot loader). The high Sierra firmware update will require the older video card to be installed in order to get it done.
So basically, yes you can put the RX580 in and probably boot up Sierra and it will probably work. But you will then need to put the old card back in, in order to upgrade to High Sierra, and then put the Metal card back in before upgrading to Mojave.
- Will a Metal card such as the RX580 work on older versions of OSX
- Will a metal card be able to run the High Sierra upgrade
However when you boot up, you will see a black screen until just before the desktop comes up.. as is the case with Mojave as well.
But #2 is the issue. The High Sierra installer performs a firmware update from the boot screen (which the RX580 does not provide). Its during that firmware update (which is not in OSX, its in the boot loader). The high Sierra firmware update will require the older video card to be installed in order to get it done.
So basically, yes you can put the RX580 in and probably boot up Sierra and it will probably work. But you will then need to put the old card back in, in order to upgrade to High Sierra, and then put the Metal card back in before upgrading to Mojave.