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
6GB KIT (3 x 2GB) for HP-Compaq Z Workstation Series Z400 (6 DIMM Slots). DIMM DDR3 ECC Unbuffered PC3-10600E 1333MHz Server Ram Memory. Genuine A-Tech Brand. at Amazon.com
XMS3 — 6GB Triple Channel DDR3 Memory Kit
Kingston 6GB (3 x 2GB) DDR3 1333 (PC3 10600) Triple Channel Kit Desktop Memory Model KVR1333D3N9K3/6G Desktop Memory - Newegg.com