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
Crucial 32GB ECC Load Reduced DDR3 1600L (PC3 12800) Server Memory Model CT32G3ELSLQ4160B - Newegg.com
JGGRT Dell | Used & Refurbished
V7 32GB DDR3 PC3-12800 - 1600mhz 1.35V SERVER ECC REG Server Memory Module - V71280032GBR