Hi, well...
to summaries...
I have a mac pro 4,1 flashed to a 5,1, I upgrade the cpu's y and everything was working fine, except that I have the gt120 has a gpu... not good. So I install the Sapphire RX580 pulse 8gb... the one that everyone was saying that was plug and play from High sierra... the thing is that it't didn't boot up... with both cards in, it boot up, but it didn't recognized the rx580... so this was early this year... I Tried everything..I`m shure that the card work, because I boot to linux with a pendrive and it worked fine, and I also put it on a windows and it also worked just fine.... so then covid happened and I didn´t get the chance to do anything else with the GPU untill this week I got the change to put on a windows n chek the BIOS of the GPU, and compared to the original BIOS of the GPU and the where some things different, so I watch a few tutorials and I decided to flash the GPU BIOS with the first versión that I find, that was this one
https://www.techpowerup.com/vgabios/197002/sapphire-rx580-8192-171115
and try one more time to see if something happended... and yes, I got a screen, but it got stuck after several minutes... so I decided to do a Clean Install of sierra and the outcome was that now I got to the loggin screen, I put the password, but it get stuck there...not frozen, just stuck forever... the thing is that, I can get it to open in safe mode.
I have tried with boot GPUS on the mac and the result is the same.
Also, when I got it to start in safe mode, the sistem recognized the GPU as a rx580...and the gb count wasn't 8gb...
So there I`m...did I install the wrong BIOS for the GPU?, or it`s something else on my mac?...
Any Ideas?
Thanks!