Patriot Signature 4GB DDR3 PC3-12800 (1600MHz) CL11 SODIMM. Patriot Memory's Signature Line DDR3 SODIMM memory delivers the quality reliability and performance expected for today's notebook needs. This 4GB module is designed to run at PC3-12800 (1600MHz) at CAS 11 latency timings. Built using specific build-of-materials (BOMs) we ensure that every module meets and exceeds industry standards: offering you a hassle-free upgrade. We certify every component that goes into our modules including the modules themselves which must pass strict standards to ensure compatibility quality and reliability. With free customer service and a lifetime warranty Patriot Memory's Signature memory modules are a perfect system upgrade option.