In the advanced mode of BIOS, there is a section to adjust CPU and memory settings. It may be known as AI Tweaker, then look for an option named Ai Overclock Tuner. Set this to DOCP or EOCP, then check if DRAM Frequency is set to DDR3-1866. If so, check DRAM timings and voltage while your at it. Once all correct, set CPU-NB Voltage +0.05V, F10, save, exit, then everything should be ready to go. Give a test a let us know how it goes.
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