SK Hynix 32GB 2Rx4 PC4-2666V ECC RDIMM Black iMac Pro / Mac Pro 2019 Memory
Rank: 2Rx4. Also works inECC-compatible PCs, workstations, and servers that support DDR4 ECC RDIMM. 100% compatible withApple iMac Pro (2017) andMac Pro (2019). Capacity: 32GB.