It has DDR4-2666 ECC RDIMM. SK Hynix 16GB HMA82GR7AFR8N-VK. Error Correction:ECC (Error-Correcting Code). Good condition. R2 Condition: C4- Used Good. R2 Functionality: F6- Like New. Speed:PC4-21300 / DDR4-2666V (Operates at native 2666MHz with a standardized CAS Latency of CL19. ).