MPX

MPX (Mac Pro eXpansion) is an expansion module configuration and proprietary connector introduced by Apple in December 2019 for their 3rd-generation Mac Pro.

Description
An MPX module can fit one of two MPX bays in the 3rd-generation Mac Pro. The bays provide more power than is typically available through a standard PCIe slot in combination with a proprietary connector. A module can occupy 1 or 2 double-wide slots in each bay. Two matching quad-wide modules can be interconnected through a high-speed Infinity Fabric Link. 3rd-party MPX modules have also been developed for use as high-performance GPUs and internal storage solutions.

GPU modules

 * Radeon Pro Vega II MPX Module — 14.1 teraflops*
 * Radeon Pro Vega II Duo MPX Module — 28.3 teraflops*
 * Radeon Pro 580X MPX Module — 5.6 teraflops
 * Radeon Pro W5500X MPX Module — 5.6 teraflops
 * Radeon Pro W5700X MPX Module — 9.4 teraflops
 * Radeon Pro W6600X MPX Module — 9.8 teraflops
 * Radeon Pro W6800X MPX Module — 16.0 teraflops*
 * Radeon Pro W6800X Duo MPX Module — 30.2 teraflops*
 * Radeon Pro W6900X MPX Module — 22.2 teraflops*
 * * Supports Infinity Fabric Link to double performance.

Articles

 * Apple Shares Compatibility Details for Mac Pro's New Radeon Pro W6000 Graphics by Joe Rossignol at MacRumors (2021-08-05)
 * New Mac Pro MPX Modules Add Potent AMD Radeon W6000 GPUs by Chris Davies at SlashGear (2022-08-03)