Sorry, I don't check this much. I have it mounted on the front of the case actually. I have an ML120 as rear exhaust, three ML120s as exhaust on top, and 6 ML120s as push-pull on the radiator mounted on front as intake. I also have one of the Deepcool fans as intake in the bottom. Sorry if this is too late to make a difference.
My voltage required was pretty low, only 1.26Ghz