I recently purchased a pc with the msi motherboard h170a. I bought ddr4 1x8gb of the hyperx fury at 2400 mhz. http://www.kingston.com/dataSheets/HX424C15FB_8.pdf My motherboard supports a maximum of 2133 mhz so it adjusted my dram speed to that. Is it safe to buy another 8gb ram of kingston hyperx that's running 2133 mhz ( http://www.kingston.com/dataSheets/HX421C14FB_8.pdf )alongside my already installed ram?