1) It's not the same, exact RAM even if the model number is the same, because the RAM manufacturers change their products very often, sometimes weekly.
1.5) What model number is each of your RAM sticks? What are the spec voltage and speed rating and memory timings for each one?
2) Is any of your RAM factory overclocked? That is, do any of the 4 DIMMs have voltage specs higher than 1.9V? If so, go into your BIOS and set the RAM voltage (maybe called DIMM voltage) to the highest voltage spec of any of your 4 DIMMs. Save your BIOS changes and reboot.