Patriot Memory's Signature Line DDR3 Non-ECC Unbuffered SODIMM memory delivers the quality, reliability and performance expected for today's computer needs. This 8GB kit (2 x 4GB modules) is designed to run at PC3-8500 (1066MHz) at CAS 7 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 SODIMM modules are a perfect system upgrade option.