Note1: 2PCS = tested successfully with 2 modules Note2: The O.C. mode is not guaranteed. It depends on whole system configuration and other parameters. Note3: For system stability, use more efficient memory cooling system to support a full memory load (2 DIMMs) when overclocking. Note4:Due to the configuration of CPU, the default speeds of DDR3 2333/2300 MHz will operate at DDR3 2200/2200 MHz.