G.Skill 32GB PC3-14900. Internal memory: 32768 MB, Internal memory type: DDR3, Memory clock speed: 1866 MHz. Memory voltage: 1.5 V. Height: 40 mm. Compatibility: Rampage IV Extreme P9X79 DELUXE X79A-GD45 X79A-GD65 (8D) X79 Extreme 4 X79 Extreme 9 Pure black X79N