Kingston Technology System Specific Memory 4GB Dual Rank Kit, 4 GB, 2 x 2 GB, DDR2, 240-pin DIMM Kingston Technology System Specific Memory 4GB Dual Rank Kit. 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: 3