RAM & Memory Upgrades
16GB (2 x 8GB) DDR4 2933MHz PC4-23400 288-PIN ECC REGISTERED DIMM (RDIMM) MEMORY RAM KIT COMPATIBLE WITH MAC PRO (2019)
SIZE/CAPACITY: 16GB KIT (2 x 8GB) VOLTAGE/POWER CONSUMPTION: 1.2v CAS LATENCY: CL21 SPEED: PC4-23400 (2933MHz) TYPE/INTERFACE: 288-PIN DDR4 ECC REGISTERED DIMM (RDIMM) MAC PRO (2019)
https://www.bizrate.co.uk/ram_memoryupgrades/16gb-2-x-8gb-ddr4-oid25831781205.html