4GB DDR3-1600MHZ RDIMM SRX8 ECC FACTORY ORIGINAL SVR MEMAddOn 4GB DDR3 SDRAM Memory Module 4 GB (1 x 4GB) DDR3 1600 PC3 12800 DDR3 SDRAM 1600 MHz Single rank Memory CL11 1. 50 V ECC Registered 240 pin DIMM Lifetime Warranty VPN: AM1600D3SR8RN 4G SKU: RSC994311 UPC: 821455469804 DIMM 4 GB of memory to heighten your computer's performance DIMM 4 GB memory allows you to have more programs open at a time 1600 MHz memory speed for great multitasking capability