So I currently built a new computer with a single stick of HyperX Fury Ram at 8 gb and running at 1400 hz, im my old rig (prebuilt) I have an extra 4 gb stick at 800 hz. So My question is, Will it be better to run 12gb of ram at 800hz or 8 gb of ram at 1400hz. And Is it possible to run 3 ram sticks if my mobo has 4 ram slots? Asus B85M-G R2.0