Desktop computers have more than one fan - processor (CPU), dedicated or discreet video card (GPU), power supply (PSU), and one or more chassis (case) fans.Your Dell computer may contain several fans to keep the internal components cool: Lint and dust accumulation prevents air from flowing around the cooling fins and causes the fan to work harder.

It is important to keep dust from accumulating in your computer and ensure adequate ventilation to help reduce heat. If you notice the computer fan running constantly and making an abnormal or loud noise, this might indicate that the computer is not running as efficiently as possible, and/or clogged air vents.

Excessive heat can also cause a significant decrease in performance as most processors automatically reduce the speed of the processor to help compensate for heat-related problems. Blocked air vents can cause serious performance issues by restricting airflow, this can cause the processor, system memory (RAM), and other hardware to overheat which may lead to a potential hardware failure.

Dell m90 laptop fan control