IBM 49Y1565 COMP 16GB DDR3-1333MHZ ECC CL9 DR RDIMMAddOn 16GB DDR3 SDRAM Memory Module 16 GB (1 x 16GB) DDR3 1333 PC3 10664 DDR3 SDRAM 1333 MHz Dual rank Memory CL9 1. 35 V ECC Registered 240 pin DIMM Lifetime Warranty VPN: 49Y1565 AM SKU: RSC137293 UPC: 821455323557 Whether you are playing games, using heavy loaded OS or video editing software, the 16 GB of memory will make them run in a flash 1333 MHz speed with Registered signal and CL9 latency to execute routine softwares at a steady pace DDR3