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6 Jul 2009PCI 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.
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Mac Pro: About the PCI Express slots
The outside of the box said "Windows base machine or better", so I bought a Mac.