The product is a set of 8GB (4x2GB) DDR2-800 PC2-6400 ECC FB-DIMM RAM modules designed for the Apple Mac Pro 3,1 Early 2009 model. These memory modules are fully buffered, ensuring stability and performance. With a total capacity of 8GB spread across 2 modules, each with a capacity of 2GB, these RAM modules are a reliable choice for upgrading your Mac Pro's memory capacity. The modules have a lifetime manufacturer warranty and are compatible with the specific Mac Pro model listed.