Kingston HP 12GB 3x4GB DDR3 1333MHz ECC at Amazon.com
CMS 12GB (3x4GB) DDR3 10600 1333MHZ ECC NON REGISTERED DIMM Memory Ram Upgrade Compatible with HP/Compaq® Workstation Z600 B3 SERIES DDR3 ECC For Server Only - B81 - Newegg.com
12GB(6X2GB) DDR3 PC3-10600R 1333MHz DTM64304C Server Memory RAM | eBay
CMS 12GB (3x4GB) DDR3 10600 1333MHZ ECC Non Registered DIMM Memory Ram Upgrade Compatible with HP/Compaq® Workstation Z600 B3 Series DDR3 ECC for Server Only - B81 at Amazon.com
Kingston 12GB (3 x 4GB) 240-Pin DDR3 SDRAM System Specific Memory for HP/Compaq - Newegg.com
CORSAIR 12GB DDR3 RAM - CORSAIR DOMINATOR and XMS3 (within 6 total sticks) | eBay