Hi.i am planing to build a computer,some guy here has a ddr4 hyperx furry 2400mhz cl15 with am4 a12 + mobo and ddr3 2133 cl10 also with fm2 a12+mobo.the seller is offering it for a low price and I want to know from you,wich of these two is faster for gaming? By the way the ddr3 is 50$ cheaper...