Touched the back of my PC case where my Radiator was mounted earlier and nearly burnt my fingers! The whole area surrounding was piercing hot! I took my pc apart, took watercooling system off, cleaned the very dusty radiator off totally , and refitted the CPU heatsink. I moved the radiator to the lower front of the case so I can see how hot it is easier, and to keep it further away from the hottest area of the motherboard. Moral of the story? Clean your radiator free of dust or it will get very hot indeed!