Kingston Technology ValueRAM 4GB 667MHz DDR2 ECC CL5 DIMM (Kit of 2), 4 GB, 2 x 2 GB, DDR2, 240-pin DIMM Kingston Technology ValueRAM 4GB 667MHz DDR2 ECC CL5 DIMM (Kit of 2). Internal memory: 4 GB, Memory layout (modules x size): 2 x 2 GB, Internal memory type: DDR2, Memory form factor: 240-pin DIMM, CAS latency: 5, ECC