This product is a lot of 18 SK Hynix 4GB DDR4 server RAM memory modules, specifically the HMA451R7AFR8N-TF model. Each module has a capacity of 4GB, a form factor of RDIMM, and features ECC memory and registered functionality. With a bus speed of PC4-17000 (DDR4-2133), these memory modules are designed for high performance and reliability in server environments. Perfect for enterprises looking to enhance their networking and server capabilities, this lot of SK Hynix RAM offers quality and efficiency at scale.