PCIe NVMe as boot device

I like to go with NVMe (also have one Apple SSD free at this moment). It's faster than SSD :) So if I can't use it for boot drive can I probably don't need it :(

Well it's look like I can use it only on Mac Pro 5.1:

Booting support requires that your motherboard BIOS support booting via PCIe NVMe drives. Booting on Mac Pro (2010-2012) requires macOS 10.14.6.

But how I make BIOS on 5.1 support booting via PCIe NVMe drive ?

While NVMe is faster the limits of the rest of the system will hold it back. As far as altering the systems firmware I'm not sure if that is even possible in this series.

It would take a bit of study and engineering to redo Apples efforts. Maybe its a good weekend project, I'll warn you its going to consume quite a few hours.

@danj thanks a lot, it’s look like my favourite Mac Pro is really old :( and maybe it’s really time to look for some M1/M2 :)

@roboscrap - I would't jump quite yet! Did you check out this Devs are making progress getting macOS Ventura to run on unsupported, decade-old Macs

@danj I didn't - that is interesting but will see how "hard" will be to get macOS Ventura full version :) anyway I am now looking for Mac Pro 5.1 as I can't find RAM for 3.1 for long time (and reasonable price) and I am stuck with 14GB what isn't too much :(