IBM 46W0779 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: 46W0779 AM SKU: RSC935559 UPC: 821455324363 16 GB of memory can produce approx. 10K MIPS and as a result, your system gets more room to run complex apps. 1866 MHz of memory speed with Registered signal and CL13 latency skillfully manages the variety of apps and computational tasks