A long, wonderful thread, thanks. I
think I understand what I need to do, but I would really appreciate confirmation (or correction!).
I inherited a loaded nMP (12 core, 64GB, D700s) with no internal drive. Seems to work (mostly) fine from an external USB SSD*, but I need to buy and install an internal (1 TB) drive. Current Boot ROM is MP61.0120.B00 and I can't update it until I install an internal PCIe drive. I have no idea what version of OSX was used before the internal drive died and was removed.
I
think my choices are as follows:
(1) A real Apple 1TB SSUBX (4 lane) PCIe
(2) The 1TB OWC Aura Pro X2 NVMe + tiny (128MB) SSUAX for firmware updates
(3) A 1TB Samsung 970 EVO|PRO NVMe + NVMe adapter + tiny (128MB) SSUAX for firmware updates
(3a) A
2TB Samsung 960 EVO NVMe + NVMe adapter + tiny (128MB) SSUAX for firmware updates
Do I understand correctly that a SSUBX PCIe drive is pretty much as fast as NVMe #2 and #3 above? If so, and I can find one on eBay for a reasonable price, then that seems to make the most sense to me. I've seen what I think are 1TB Apple SSUBX drives for under $350 (please check this example for me if you don't mind:
eBay Link).
(2) costs about the same ($300 for the OWC, ~$75 for a tiny PCIe), but I have to change out the drive for fw updates.
(3) is a
little cheaper, but not much. It may (?) be faster, and it has the advantage that I get a standard NVMe drive that can be used elsewhere, but I don't plan on leaving the nMP without an internal drive ever, and I'll still have to change out the drive for fw updates.
(3a) is tempting, and only adds about $50 to the cost...
* It has been an adventure getting this working. Would have been impossible without the info in this thread. Connected up a USB 3 external SSD, held down command-option R, and an internet recovery proceeded as expected. Had to format the external SSD as APFS with Disk Utility before the OS installer would install 10.14.5 Mojave, but that went well. Everything seems to work except that once I shut down, the external drive won't start up the nMP and isn't recognized as available with an option-boot. I can restart the nMP as expected. So this is weird, but should be a non-problem once I get an internal drive.
Again, thanks for all the help!
Billy