If your work demands that you use the computer for a long time or you use it personally for browsing and other stuff, it means you need a PC fan case which will keep the air inside the case of your computer at the right ideal GPU temperature. It is important that every component inside the case is maintained at the right temperature for it to work well. When you are using a computer case, it becomes evident how the outer components could get heated up and you can see that the temperature is always higher. This, in the long run, might decrease the effectiveness of your computer.
Although keeping without the case might help, it also means accumulating a lot of dust and dirt on to your computer. Now with the case, using a fan inside the case is the best way to keep the computer and different components at the right temperature. The air dissipated from the case if it remains hot it means there is no way for the hot air to come out of the system to clear up. A fan in that place will help in balancing the inside temperature and outside temperature.
A system fan is ideally located inside the computer and attached to the back of the case mostly and in some cases attached to the front of the computer. These fans help in blowing out the heated up air outside the case thereby enabling space for the cool air from outside to come inside. This makes sure that the temperature is at the right level. The cases and fans are available in many sizes and one could choose the one that will best suit their computer. It is also important choosing one based on where you have placed your computer on an open table or closed.