You don’t have to be a rocket scientist to figure out that exceeding normal performance levels is going to lead to generation of excessive heat. Try running on the treadmill for 15 minutes and you will automatically feel hot. Try working under the hot sun and you will start sweating a lot.
Abnormal conditions often results in heat generation is a universal rule. Your computer is no exception to this rule. Each and every hardware device generates a certain amount of heat. The resistance that electricity faces often leads to heat generation. A certain portion of the electric current has to be expended to overcome the resistance.
This is the reason why all computing devices have internal cooling systems ranging from heat paste to cooling fans that circulate the air and prevent the heat from stagnating inside the cabinet.
Well, do not expect normal cooling solutions to work properly in an overclocked computer. Irrespective of whether you have overclocked your processor or your video card, you will need better air cooling. Cooling inside the computer is not just about dissipation of the hot air. It is also about inflow of cooler. You may need an intake fan that will suck normal temperature air from the outside and an exhaust fan that will pump the hot air out of the box.
You will also have to focus on placement of the fans to ensure that the exhaust fan does not automatically push out the cool air that is pumped into the computer.
You may still face heating problems despite the presence of all these equipments simply because you have allowed wires to hang around in the box in a disorganized manner. The flat wire of your hard disk should be taped in such a manner that it does not prevent proper flow of air. Make use of duct tape to hold the wire in its place.