If it can be installed, it is basically correct

Check whether the fan is supplying air to the CPU and not extracting air

Teach you how to fix it in a fixed place The solution is, if you don’t have a cotton pad, you can find scrap clothes, cut a small circle, and place it between the screw and the fan, which can reduce the noise

The low speed may be because the shaft in the middle of the fan is short of oil. For home oiling, buy a bottle of Vaseline paste, open the fan label, use a toothpick to carefully apply some Vaseline paste, and then turn the fan with your hands until it is evenly distributed. Vaseline is not conductive, so feel free to use it. Apply more or less. OK. Then the trademark is put back on and everything comes together.