Transcend 8GB JetMemory (4GB x 2 Kit) DDR3- 1600 SO-DIMM 1Rx8 Kit for Mac Pro Early 2011 - Mid 2012 & Mac Mini, Mid 2011 - Late 2012 (TS8GJMA424H) For MacBook Pro (Early 2011-Mid 2012) and Mac mini (Mid 2011-Late 2012) 512Mx8 bit 1.5V Timing 11-11-11 Operating Temperature 0 ~ 85 C Compatible with select Mac systems. Verify model for compatibility For MacBook Pro (Early 2011-Mid 2012) and Mac mini (Mid 2011-Late 2012) SO DIMM 512Mx8 bit 1600 Mbps 1.5V Timing 11-11-11 1 Rank Operating Temp. 0 DegreeC ~ 85 DegreeC Compatible with selected Mac systems. Verify model for compatibility