HP 5189-2180 Hynix 2GB PC2-6400U DDR2 800 Non-ECC Unbuffered Desktop Memory Kit Manufacturer: Hynix HYMP125U64CP8-S6 Memory Kit HP Part number: 5189-2180 Memory Type: 240-Pin DDR2 SDRAM Capacity: 2GB Bus Type: PC-6400U 800Mhz