Samsung DDR4 2133MHzCL15 16GB RegECC 2Rx4 (PC4 2133) Internal Memory M393A2G40DB0-CPB RDIMM - Application : Server (ENTREPRISE ONLY) - check your server configuration Supports x4 (2Rx4) up to 2 ranks per DIMM and 3DPC configuration Error correction available by added 8 bit parity signals ECC REGISTERED