LENOVO 4X70F28588 COMP 4GB DDR4-2133MHZ ECC SRX8 RDIMMAddOn 4 GB DDR4 SDRAM Memory Module 4 GB (1 x 4GB) DDR4 2133 PC4 17000 DDR4 SDRAM 2133 MHz Single rank Memory CL15 1. 20 V ECC Registered 288 pin RDIMM Lifetime Warranty VPN: 4X70F28588 AM SKU: RSC718104 UPC: 821455462089 RDIMM 4 GB memory allows you to have more programs open at a time 2133 MHz of memory speed with CL15 latency skillfully manages the variety of apps and computational tasks DDR4 SDRAM operates at an effective bus speed with minimal