Kbase Article of the Week: Mac Pro (Early 2008 to Mid 2012): About the PCI Express Slots →

Apple Support:

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: