Questions about Sierra install

[AllGold]

MrNoBody wrote:
The Mac Pro is stuffed with drives...

If you have a mix of SATA-II internal bus mixed with a PCI-e device it may cause
issues, especially if there's a firmware update involved. Also, some PCI-e cards like
USB 3.x controllers can cause conflicts.

Doesn't happen all the time but it can drive you friggin crazy!

Yeah, my boot drive is an SSD in a PCIe card.

PeterW wrote:
When you installed Sierra, did the installer also do a firmware update? If not, no matter how much you hate the idea, you’re going to have to install it on a drive connected to one of the internal SATA connections.

I do have something I can install on the SATA bus rather than the PCIe card.

But I thought Sierra didn't need new firmware--only High Sierra and beyond.