Buffalo D2U800C-2GX2EU, 4 GB, 2 x 2 GB, DDR2, 800 MHz, 240-pin DIMM Buffalo D2U800C-2GX2EU. Component for: PC/server, Internal memory: 4 GB, Memory layout (modules x size): 2 x 2 GB, Internal memory type: DDR2, Memory clock speed: 800 MHz, Memory form factor: 240-pin DIMM, CAS latency: 5