Hello,
I recently addes another 2 RAM dimms to my setup (http://www.gskill.com/en/product/f3-12800cl8d-8gbrm) and found out that I didnt configure my RAM with the correct timings/voltage in the bios so I took quick care of that(they were running at 11-11-11-30 1.5V instead of 8-8-8-24)...