Reduce the noise of the CPU fan and video card fan

There are two ways to reduce fan noise:
1, reduce the speed of the fan. Can be adjusted in BIOS or graphics console (requires motherboard support). You can also use the fan governor. However, this method will reduce the thermal performance to some extent.
2, the use of good quality mute fan. General prices are relatively high.
If you are an old fan, you can also reduce the noise by cleaning up dust and adding lubricant. However, it is necessary to pay special attention to the need to add lubricants to the fan is a certain degree of difficulty, if their ability to do not strong, no experience will not be easy to try. Once the method of adding lubricant is incorrect or the addition control is not good, the lubricant will overflow, and the overflow lubricant will be mixed with dust to form sludge, and the fan cannot turn. A cooling device that lacks a fan can cause heat and burn!!!. The CPU is fine, because the motherboard has protection. Once the CPU temperature is too high will automatically power off. The graphics cards are not so lucky, they're basically going to burn directly.