Patriot Memory's Signature Line DDR2 Non-ECC Unbuffered memorydelivers quality, reliability and performance expected for today's computerneeds. This 4GB module is designed to run at PC2-6400 (800MHz) at CAS 6latency timings. Built using specific build-of-materials (BOMs) we ensurethat every module meets and exceeds industry standards: offering you ahassle-free upgrade. We certify every component that goes into ourmodules, including the modules themselves, which must pass strictstandards to ensure compatibility, quality and reliability. With freecustomer service and a lifetime warranty, Patriot Memory's Signaturememory modules are a perfect system upgrade option.