Radeon Pro W5500X MPX Module

The Radeon Pro W5500X is a GPU that was developed by AMD as an optional MPX module for the 3rd-generation Mac Pro. Up to two can be installed at a time, but it does not support Infinity Fabric Link.

Description
The Radeon Pro W5500X MPX Module is based on AMD's Navi 14 workstation graphics chip that was fabricated on the 7 nm process. The GPU can produce up to 5.6 teraflops and included 8 GB of GDDR6 video RAM. The module features two HDMI ports and communicates with the Mac Pro's built-in Thunderbolt 3 ports through the proprietary MPX connector. It could support two 5K or 6K displays, or four 4K displays. The MPX module took up the space of a double-wide PCIe card, but did not require an auxiliary power cable as it could draw all necessary power from the MPX connector.

Release
On July 1, 2020, Apple began offering the Radeon Pro W5500X as the new entry-level model of the W5x00 series, and an alternative to the default Radeon Pro 580X MPX Module in a similar form factor. On March 8, 2022, the Radeon Pro W5500X replaced the 580X as the default GPU of the 3rd-generation Mac Pro, while the Radeon Pro W6600X MPX Module took its place as a cost-effective entry-level upgrade option.