Radeon Pro Vega II MPX Module

The Radeon Pro Vega II 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 and it supports Infinity Fabric Link to increase the speed of inter-GPU data transmission by up to five-fold.

Description
The Radeon Pro Vega II MPX Module is based on AMD's high-end Vega 20 workstation graphics chip that was built on the 7 nm process. The GPU clock speed was 1.574 GHz, which could be boosted to 1.72 GHz, producing up to 14.1 teraflops. It contained 32 GB of video RAM, running at 1 GHz. It features one HDMI 2.0 port and four USB-C compatible Thunderbolt 3 ports. It could support two 6K displays, three 5K displays, or six 4K displays. The first Thunderbolt 3 port and the HDMI 2.0 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.

Successor
On August 3, 2021, Apple began offering the Radeon Pro W6800X MPX Module as a higher-performance option, though the Radeon Pro Vega II remained on sale for existing users who wished to add a second matching module.