I'm currently building my first computer, and the amount of RAM I want is around 12GB. Currently I have one stick of G.SKILL Ripjaws X Series 8GB, and I was thinking of adding a stick of 4GB HyperX Fury. Is there any difference between the two sticks? My motherboard has 4 dual channel memory slots. Basically I want to know if there would be any issues with the RAM since they're from different brands.