I have 1 on the CPU of course, which isn't hte standard. I got a fairly beefy one. And thne the case has 4 fans that are controlled with 2 knobs on the front of the case. For day to day I keep them at the lowest (even though the computer can override and turn them up) for noise problems, but if I game or edit videos, I blast them all the way up to full power. There is one fan in the back, one in the front, one at the top and one on the side door.