Crucial 32GB ECC Load Reduced DDR3 1600L (PC3 12800) Server Memory Model CT32G3ELSLQ4160B - Newegg.com
32GB (1x32GB) DDR3-1600MHz PC3-12800 ECC LRDIMM 4Rx4 1.35V Load Reduced Server Memory by NEMIX RAM at Amazon.com
7N0WM Dell | Used & Refurbished
96.0GB OWC Memory Module For Mac Pro (December 2013)
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