HP 20-1F88A-01 - 1GB ECC RIMM, 800Mhz, 288Mb, 40ns (16 device) - Only Supported on 1000/1150 Mhz cpu`s Retail
1GB PC2-6400 ECC: HP GH739AA - 1GB (1x1GB) 800Mhz PC2-6400E ECC 1.8V 240-Pin Server Ram Memory Sale $15.00 Retail $34.00
1GB 800Mhz PC2-6400U: 1GB 800Mhz PC2-6400U DDR2 240-Pin DIMM Non-ECC Desktop RAM Memory Module Sale $10.00 Retail $32.00
1GB PC2-6400 ECC: HP 445166-051 - 1GB (1x1GB) 800Mhz PC2-6400E ECC 1.8V 240-Pin Server Ram Memory Sale $15.00 Retail $34.00