Do the 2023 Mac Pro PCIE support cards with UEFI PCIe bifurcation

Hello Kbogner,

Thank you for a great question. I would and (now) do want to know for myself. After some digging this is the best I was able to find on Apple's support info. I hope that someone with more info will be able to shed some light on this for you.

PCIe cards you can install in your Mac Pro (2023) - Apple Support

Thank you

Mikel

I just tried an Asus Hyper m.2 nvme expansion card that does require bifurcation. Tried it with 1 and 2 name drives, and tried it in slot 4 and 5 on my Mac Pro 2023.

Nothing recognized in any case.

So, based on your experiments, you are suggesting that Bifurcation is likely NOT supported, is that right?

I believe that it is not supported. Again, only based on testing with a single PCIe card that requires bifurcation.

That's one more experimental result than anybody else has.

Kind of? My 2009 Mac Pro (5,1) allowed me to install a 1tb WD nvme PCI card that 'boots' 2021 Monterey 12.7 'slowly,' but once its on, it 'operates' VERY fast! I'm waiting on a Sonoma 14 drive!