Mac Pro EFI Firmware Update v2.0
This update is recommended for all Mac Pro (Late 2013) models. This update improves system reliability during reboot, resolves an issue with memory self-test, and improves graphics power management when using Boot Camp.
The update is labeled as Mac Pro EFI Firmware Update v2.0 and is just 5 MB. We would assume that you can grab this update via Mac App Store once you get your hands on a Mac Pro (ship times have already slipped to February!), but you can download it directly from the link below.