PCI Express (Peripheral Component Interconnect Express), or PCI-E, is a newer implementation of PCI which uses a much faster physical-layer communications protocol than older PCI bus architectures.
Rather than using a bus as PCI did, PCI Express uses dedicated, unidirectional, point-to-point connections known as “lanes” to communicate with PCI Express devices.
The first generation of Mac Pro came with a program named Expansion Slot Utility:
I wonder if the new one will come with something similar…
Update: I guess so:
The icon of Expansion Slot Utility has been updated for new Mac Pro ???? pic.twitter.com/TVdxAUMxvR
— Khaos Tian (@KhaosT) June 18, 2019