LENOVO 0C19535 COMP 16GB DDR3-1600MHZ ECC DRX4 RDIMMAddOn 16GB DDR3 SDRAM Memory Module 16 GB (1 x 16GB) DDR3 1600 PC3 12800 DDR3 SDRAM 1600 MHz Dual rank Memory CL11 1. 35 V ECC Registered 240 pin DIMM Lifetime Warranty VPN: 0C19535 AM SKU: RSC825260 UPC: 821455278840 16 GB of memory to maintain symmetry with processor and hard drive and bring out the ultimate computing experience 1600 MHz memory speed with Registered signal and CL11 latency for great multitasking capability DDR3 SDRAM interface