32GB (1x32GB) DDR3-1600MHz PC3-12800 ECC LRDIMM 4Rx4 1.35V Load Reduced Server Memory by NEMIX RAM at Amazon.com
NeweggBusiness - Black Diamond Memory VLP 32GB (2 x 16GB) 240-Pin DDR3 SDRAM ECC Registered DDR3 1600 (PC3 12800) System Specific Memory Model BD16GX21600MTR97IB