Full Details from Amazon.com : http://www.amazon.com/gp/product/B00JIJU8BA?tag=onigi-20<br /><br />Transcend 4 GB DDR3 1333 ECC unbuffered DIMM 1Rx8 TS4GJMA343H (Mac Pro Mid 2010 - Mid 2012<br /><br />ECC DIMM <br />512Mx8 bit <br />1333Mbps <br />15V <br />Timing 9-9-9 <br />1 Rank
