OWC 32GB (2 x 16GB) PC10600 DDR3 ECC-R 1333MHz DIMMs Memory Compatible with Mac Pro Early 2009 & Late 2010 'Nehalem' & 'Westmere' Systems and Early 2009 Xserve. (OWC85MP3S9M032K) at Amazon.com
CMS 32GB (4X8GB) DDR3 12800 1600MHz ECC Registered DIMM Memory Ram Upgrade Compatible with HP/Compaq® Workstation Z620 Ddr3 Ecc Reg for Server Only - B120 at Amazon.com