The Signature Series 4GB DDR3 PC3-12800 1600 MHz Ultrabook Memory Module from Patriot is a dual rank double-sided module designed to run at 1600 MHz (PC3-12800) at CAS 11 latency timings. Works with Intel 3rd Generation mobile processors and running at just 1.35V, the SODIMM module is optimized for ultra low power consumption, providing efficient performance. This memory module is hand tested and offers plug-and-play performance for the most demanding mobile applications.