The G-Skill DDR2 2x2GB F2-8500CL5D-4GBPI C02022026B memory modules are high-quality DDR2 SDRAM units designed for desktop computers. With a capacity of 2GB per module and a bus speed of PC2-8500 (DDR2-1066), these DIMM modules offer fast and reliable performance for your system. The lifetime manufacturer warranty ensures durability and support for your memory upgrade needs. Upgrade your computer with this reliable and high-performing memory kit from G. SKILL.