Radeon Pro W5700X MPX Module

The Radeon Pro W5700X 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 W5700X MPX Module is based on AMD's Navi 10 workstation graphics chip that was fabricated on the 7 nm process. The GPU clock speed was 1.243 GHz, which could be boosted to 2.04 GHz, producing up to 9.4 teraflops. It contained 16 GB of GDDR6 video RAM, running at 1.75 GHz. The module features one HDMI 2.0/2.1 port and four USB-C compatible Thunderbolt 3 ports. It could support three 5K or 6K displays, or six 4K displays. The first Thunderbolt 3 port and the HDMI port shared a PCIe lane, reducing the output of that Thunderbolt 3 port if the HDMI port was used. The MPX module took up the space of two double-wide PCIe cards, but did not require an auxiliary power cable as it could draw all necessary power from the proprietary MPX connector.

Release
On April 16, 2020, Apple began offering the Radeon Pro W5700X as a higher-performance alternative to the default Radeon Pro 580X MPX Module that was much cheaper than the Radeon Pro Vega II.