HP 708641-B21 COMP 16GB DDR3-1866MHZ ECC DRX4 RDIMMAddOn 16GB DDR3 SDRAM Memory Module 16 GB (1 x 16GB) DDR3 1866 PC3 14900 DDR3 SDRAM 1866 MHz Dual rank Memory CL13 1. 50 V ECC Registered 240 pin DIMM Lifetime Warranty VPN: 708641 B21 AM SKU: RSC704511 UPC: 821455229897 DIMM 16 GB of memory to maintain symmetry with processor and hard drive and bring out the ultimate computing experience 1866 MHz of memory speed with CL13 latency skillfully manages the variety of apps and computational tasks DDR3