Hi everyone, just curious if its ok if i use G. Skill ripjaws ddr3 1600 8gb (2x4gb) for my othet remaining 2 slots on my board? I have G. Skill ripjaws ddr3 1600 on my other 2 slots, just wondering if they have to be the exact same model as my current ones to be compatible. Or can i get any other brand but have the same speed?