Note1: 4PCS = dual channel, supports 2 modules and 4 modules Note2: 2PCS = tested successfully with 2 modules Note3: Due to the configuration of CPU, the default speeds of DDR3 2400/2200/2000/1800 MHz will operate at DDR3 2133/2133/1866/1600 MHz. Note4: The O.C. mode is not guaranteed. It depends on whole system configuration and other parameters. Note5: For system stability, use more efficient memory cooling system to support a full memory load (4 DIMMs) when overclocking. Note6: It is recommended to install a memory module in DDR3_A2 or DDR3_B2 slot first!