HP 9000 2x1Gb  2Gb memory  ECC SDRAM DIMM A5840A
Total 2gb Mb , 2x 1Gb pair memory
Must be installed in pairs of equal size
HP exact part number 62689  ( Refer photos)

Works perfect, tested/Working Unit. 

*SERIAL NUMBER IS RECORDED TO PREVENT ANY POTENTIAL FRAUD*
30 Days warranty  but Warranty Void If Warranty Labels are broken/removing