IBM 49Y1562 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: 49Y1562 AM SKU: RSC419730 UPC: 821455323533 DIMM 16 GB of memory to maintain symmetry with processor and hard drive and bring out the ultimate computing experience Up to 1333 MHz memory speed with Registered signal to manage your routine softwares with pace and accuracy DDR3 1333