| There were two versions of Tempo SSD.
The original version used the Marvell 88SE9182 SATA controller.
The current version uses an ASMedia ASM1062 SATA controller.
With the discontinued Marvell controller, if a bootable volume is created on a Tempo SSD, option-boot works fine in the Mac Pro 3,1, 4,1, and 7,1 (2019), but not in the Mac Pro 5,1. The recommended workaround in a Mac Pro 5,1 is to select the boot volume in the Startup Disk System Preferences and restart. If the Tempo SSD has only data volume(s) (not bootable volumes), then option
With the current ASMedia controller, option-boot works fine in the Mac Pro 5,1. |