Memory is one of the most vital components to keep your ThinkServer operating at maximum performance and push the boundaries of productivity for all of your server applications such as virtualization, e-commerce, or file and print services. The ThinkServer DDR4 memory enables high I/O data transfer rate (1) and reduced power consumption. Faster data transfer rates mean higher performance, and with DDR4 memory this is achieved without straining the system's power needs. This offering covers: ThinkServer 4GB 1RX8 PC4-2133-E CL15 DDR4-2133 ECC-UDIMM ThinkServer 8GB 2RX8 PC4-2133-E CL15 DDR4-2133 ECC-UDIMM ThinkServer 16GB 2RX8 PC4-2133-E CL15 DDR4-2133 ECC-UDIMMTest-proven 100% compatible on listed ThinkServer Systems(2) Meets stringent ThinkServer reliability standards High bandwidth performance, up to 2133M per second per data pin Lenovo Limited Warranty Authenticity seal on every DIMM (1) Data transfer rate may vary based upon many factors and is often less than the maximum possible. (2) Compatible systems indicated in the Hardware requirements - ThinkServer systems section.