256.0GB OWC Memory Upgrade Kit
8 x 32.0GB PC23400 2933MHz DDR4 RDIMM for Mac Pro 2019 models
Mac Pro can use either RDIMM or LRDIMM, but they cannot be combined.
Mac Pro supports up to 12 DIMMs installed in configurations of 4, 6, 8, or 12 DIMMs. Configurations of 5, 7, 9, 10, and 11 DIMMs are not supported. Other configurations of 1, 2, and 3 DIMMs are for diagnostic use only.