Mac Pro 4,1 -> 5,1 XFX RX 580 flashed to Sapphire Pulse 580 does not Shut Off Mac (without button)

NickthePirate

macrumors newbie
Original poster
Jan 17, 2019
3
1
Hello Mac Rumors, I've been lurking these forums for a while ever since I have started building my Mac Pro almost a year ago. I have never needed to post a question that hasn't been asked before but I think it is time.

I use a 4k monitor when I play video games on my Windows 10 partition and my Sapphire R7 265 just was not cutting it.

So right after Christmas I was saw this (XFX Radeon RX 580 GTS XXX Edition 1386MHz OC+, 8GB GDDR5, VR Ready, Dual BIOS, 3xDP HDMI DVI, AMD Graphics Card (RX-580P8DFD6)) GPU on sale on Amazon for $180 and I pulled the trigger. When I plugged it into my Mac it initially had troubles displaying in Windows 10 but quickly went away and works fantastic while in Windows10.

However, I was not able to boot into macOS. I tried resetting the PRAM, I bought a new dual mini 6-pin to 8-pin cable, everything. After searching online I noticed other Mac Pro owners of this card either had it work or they returned it, and I also read a lot about XFX brand being incompatible with macOS.

Because of all this, I flashed the ROM in Atiwinflash with the Apple approved Sapphire Pulse version of the 580 ( https://www.techpowerup.com/vgabios/191403/sapphire-rx580-8192-170310 ), removed all the Windows drivers with DDU, then reset PRAM and bam! I got my Mac back! I even got the About page to correctly identify my GPU. But when one door closes, another one always opens...

When I went to restart my computer, the computer quits everything and the display goes black and then, that's it. The same when I go to shut the computer down, it never fully turns off. I am able to put it to sleep so I'm not too sure what the problem is. I can force it to turn off and when I turn it back on everything resumes as normal but I don't want to force kill this thing every time I turn it off or restart. Does anyone have any ideas?

Edit: I forgot to mention that it has no problems turning off or restarting in Windows, so its something with macOS.

Edit 2: The problem seems to have fixed itself, although it takes up to a minute to shut down or restart now.
 
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NickthePirate

macrumors newbie
Original poster
Jan 17, 2019
3
1
when you flashed your card , are you seeing the boot screen?
Hello, sorry for the late reply I was away from my computer for the weekend. It appears towards the end of the boot screen, I get the grey screen and it also appears when doing a software update.
 

NickthePirate

macrumors newbie
Original poster
Jan 17, 2019
3
1
I get the same thing without flashing it.
I had read some people were able to get this. Out of the box, this card would boot Windows 10 no problem but would just give a black screen whenever trying to boot to Mac. It was only after flashing one of the BIOS to the Pulse is when it would boot to Mac. Right now though, my original problem in this post has returned, it will not fully turn off or restart while in macOS. I probably should have tried to return the card but unfortunately that window has just passed.