Note1: It is recommended to install a memory module in DDR3_A2 or DDR3_B2 slot first! Note2: 4PCS = dual channel, supports 2 modules and 4 modules Note3: 2PCS = tested successfully with 2 modules 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.