Overheating is bad for the entire computer in general. All parts of the computer, especially the logic board, need efficient cooling for the entire computer to work smoothly. The CPU and video card often draw a lot of power and generate a lot of heat. Your computer’s cooling system then disperses this heat generated for a suitable internal temperature.
If this heat is not dispersed quickly, the system will overheat. This can cause connecting points or parts of the logic board to warp, which will result in a logic board failure. Inefficient heat dispersion can be caused by large dust build up, or a faulty cooling fan.