AddOn 8GB DDR3 SDRAM Memory Module - 8 GB DDR3 SDRAM - 1866 MHz - 1.50 V - ECC - Unbuffered - 240-pin - UDIMM - Lifetime Warranty

Apple Computer® MP1866E/8G Compatible Factory Original 8GB DDR3-1866MHz Unbuffered ECC Dual Rank x8 1.5V 240-pin UDIMM