G.Skill 8GB DDR3-2133. Internal memory: 8192 MB, Internal memory type: DDR3, Memory clock speed: 2133 MHz. Memory voltage: 1.5, 1.65 V. Compatibility: P8Z68 DELUXE P8Z68-V PRO P8Z68-V Maximus IV Extreme P8P67 DELUXE P8P67 EVO P8P67 PRO GA-Z68X-UD7-B3