Patriot Signature Apple 8GB (2 X 4GB) PC3-12800 (1600MHz) CL11 DDR3 SODIMM Memory Module Kit PSA38G1600SK Compatible with Apple iMac, MacBook Pro, and Mac Mini (2012 models) DDR3 1600MHz (PC3-12800) Non-ECC Unbuffered SODIMM 100% Tested at 1600MHz 1.35V/1.5V (programmed at 1.35v,backwards compatible to 1.5v) 7.8US Refresh Interval (8192 CY CLES/64MS)