Computer problems and sevice fail?

Ok I orderd a computer off of cyberpowerpc and 1 thing I orderd was 2x4gb of ram (2 $ticks)and they gave me 4 ? Wat should I do and the default water cooling idk wat its called but it got good reviews but for me after about 2 hours of just download some games its got realy realy hot is that suposed to happen ?? Is this thing defectied ?