Note1: The mainboard supports DDR3-2100 MHz DIMMs only when you install a AM3+ cpu to the mainboard. Note2: AMD FX series CPU on this motherboard support up to DDR3 1866 MHz as its standard memory frequency. Note3: When overclocking, some AMD CPU models may not support DDR3 1600 MHz or higher frequency DIMMs. Note4: Due to CPU spec, AMD 100 and 200 series CPUs support up to DDR3 1066 MHz. With ASRock design, this motherboard can support DDR3 1333 MHz.