Hynix HMA42GR7MFR4N-TF DDR4-2133 16GB/2Gx72 ECC/REG CL13 Hynix Chip Server Memory RDIMM - Application : Server (ENTREPRISE ONLY) - check your server configuration SK Hynix 16GB PC4-2133 MT/s ECC REGISTERED DUAL RANK x4 (2Rx4) RDIMM.