MP 1,1-5,1 Is AMD Radeon RX 6500 XT flashable for Mac Pro 5.1?

[TanL]

I was just given this card. Is it possible to do this? I have a 2010 Mac Pro 5.1.

 

[tsialex]

I was just given this card. Is it possible to do this? I have a 2010 Mac Pro 5.1.

Nope, for two different reasons.

The first reason is that Apple AMD GPU drivers does not support any AMD GPUs based on NAVI 24, like the RX 6500XT. No hacks/spoofing/etc can make a NAVI 24 GPU to work with macOS, at least not yet.

The second reason is that to make any NAVI 2x GPUs compatible with a MacPro5,1 is necessary to patch the GPU firmware to disable the HII requirement and only these below are patchable to work with a MacPro5,1:

• RX 6900XT
• RX 6800 / 6800XT
• RX 6600 / 6600XT

AMD Radeon RX 6800 XT / 6900 XT for macOS?

I have created a patch that allows AMD RX6600/RX6800/RX6900 cards to work on a Mac Pro 4,1/5,1 (and maybe a 3,1? I have no idea if that's even possible). I examined ROM dumps of RX6600/6600XT and RX6800/6800XT/6900XT from various manufacturers, and every one I looked at used the same (broken)...

forums.macrumors.com

AMD Radeon RX 6800 XT / 6900 XT for macOS?

By design, the Mac Pro EFI BootROM uses UGA (an older standard) for screen output. Mac-compatible cards provide UGA, which lets you see the native boot picker and the early boot screens (before MacOS loads). Without a UGA-compatible card (i.e. with non-Mac/PC cards), you'll see a black screen...

forums.macrumors.com

Without patching the NAVI 2x GPUs firmware, a MacPro5,1 does not complete POST.