Transcend 32GB Jet Memory (8GB x 4 Kit) DDR3- 1866 ECC Unbuffered DIMM 2Rx8 For Mac Pro Late 2013 (TS32GJMA545H) For Mac Pro 2013 512Mx8 bit 1.5V Timing 13-13-13 Operating Temperature 0 ~ 85 C Compatible with select Mac systems. Verify model for compatibility ECC DIMM 512Mx8 bit 1866 Mbps 1.5V Timing 13-13-13 2 Ranks Operating Temp. 0 DegreeC ~ 85 DegreeC Compatible with selected Mac systems. Verify model for compatibility