IBM 46W0784 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: 46W0784 AM SKU: RSC210259 UPC: 821455508824 4 GB of memory makes a perfect symmetry with your latest model processor and boosts up your computer's performance 2133 MHz memory speed with CL15 latency for great multitasking capability DDR4 SDRAM interface multiplexes 2 bit data