Full Details on Amazon.com : http://www.amazon.com/gp/product/B00JIJUAHC?tag=tsukuyomi-20Transcend 32 GB DDR3-1866 ECC Registered DIMM 2Rx8 TS32GJMA535H (8GBx4 | Mac Pro Late 2013Registered DIMM 512Mx8 bit 1866Mbps 15V Timing 13-13-13 2 Ranks