The Lot of 2 Corsair CM2X1024-6400 XMS2 Desktop Memory Modules is a set of DDR2 memory modules with a total capacity of 4GB. Each module has a capacity of 2GB, making it ideal for upgrading or replacing existing memory modules. These unbuffered memory modules have a form factor of DIMM and are designed for desktop computers. The Corsair brand is known for its high-quality memory products, and these modules come with a manufacturer warranty, though this may not be applicable. With 240 pins and a reliable design, these memory modules are a great addition to any computer system.