Kingston Technology System Specific Memory 8GB DDR2-667 Dual Rank Kit, 8 GB, 2 x 4 GB, DDR2 Kingston Technology System Specific Memory 8GB DDR2-667 Dual Rank Kit. Internal memory: 8 GB, Memory layout (modules x size): 2 x 4 GB, Internal memory type: DDR2, CAS latency: 5