Patriot Memory's Signature Line DDR4 SODIMM memory delivers the quality, reliability and performance expected for today's notebook needs. This 8GB module is designed to run at 2666MHz (PC4-21300) at CAS 19 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.