Is it possible to use 3 out of 4 RAM slots? Have one pair in dual channel and the third stick in single? So like [l] [l] [l] [ ] . Also, can I mix and match from different manufacturers if they have the same specs? The reason I want to do this is because the one I have right now is too tall for my Hyper 212+ and interferes with the fan. So can I mix http://www.newegg.com/Product/Product.aspx?Item=N82E16820103002 with http://www.newegg.com/Product/Product.aspx?Item=N82E16820231310