V7 4GB DDR3 PC3L-12800 - 1600MHz DIMM Desktop Memory Module - V7128004GBD-LV. Component for: PC/Server, Internal memory: 4 GB, Memory layout (modules x size): 1 x 4 GB, Internal memory type: DDR3, Memory clock speed: 1600 MHz, Memory form factor: 240-pin DIMM, CAS latency: 5