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Avant 6GB(6x 1gb) AVF7228R61F9333G0-NYABP DDR3-1333 PC3-10600 ECC REG Server RAM
CMS 6GB (3x2GB) DDR3 10600 1333MHZ ECC Non Registered DIMM Memory Ram Upgrade Compatible with HP/Compaq® Workstation Z600 DDR3 ECC UNBUFF for Server Only - B75 at Amazon.com