HP 672633-B21 COMP 16GB DDR3-1600MHZ ECC DRX4 RDIMMAddOn 16 GB DDR3 SDRAM Memory Module For Server 16 GB (1 x 16GB) DDR3 1600 PC3 12800 DDR3 SDRAM 1600 MHz Dual rank Memory CL11 1. 50 V ECC Registered 240 pin RDIMM Lifetime Warranty VPN: 672633 B21 AM SKU: RSC980974 UPC: 821455324240 16 GB of memory to maintain symmetry with processor and hard drive and bring out the ultimate computing experience 1600 MHz of memory speed skillfully manages the variety of apps and computational tasks 240 pin pin DDR3