HP 627808-B21 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: 627808 B21 AM SKU: RSC788569 UPC: 821455331828 DIMM 16 GB of memory to maintain symmetry with processor and hard drive and bring out the ultimate computing experience 1333 MHz speed and Registered signal to execute routine softwares at a steady pace DDR3 1333 PC3 10664 operates at