AddOn - Memory Upgrades 2GB DDR2 SDRAM Memory Module Cas Latency: 6 Voltage: 1.8V ECC: No Buffered/Registered: Unbuffered Features: This HP GV576AT compatible 2GB DDR2-800MHz Dual Rank Unbuffered 1.8V 200-pin CL6 SODIMM is 100% guaranteed to be compatible with your system and to work right the first time