HP 689911-171 COMP 8GB DDR3-1600MHZ ECC DRX4 RDIMMAddOn 8GB DDR3 SDRAM Memory Module 8 GB (1 x 8GB) DDR3 1600 PC3 12800 DDR3 SDRAM 1600 MHz Dual rank Memory CL11 1. 35 V ECC Registered 240 pin DIMM Lifetime Warranty VPN: 689911 171 AM SKU: RSC918052 UPC: 821455320242 8 GB capacity is enough to execute all memory hungry programs simultaneously 1600 MHz memory speed with CL11 latency for great multitasking capability 240 pin pin DDR3 SDRAM operates at an effective bus speed with minimal power