I am currently running 2 560ti SC in a COOLER MASTER Elite RC-310-BWN1-GP case with a 120mm Scythe fan on the side panel they work perfectly fine and even under heavy load the hottest my top card gets is 75c degrees and the bottom doesnt go above 70. however when the cards are idle their is about a 10 degree difference in them the top will run around 38-40c and the bottom will run around 48-50c. They are both at zero load is this ok? should i be concerned at all?