Another auxiliary fan, basically the North Bridge. In the middle of the motherboard.
If the motherboard has only one fan pin, you can buy a fan with D port. Directly powered by the computer power supply, this kind of fan is also very common.
DIY is the abbreviation of English Do It Yourself, which literally translates as "do it for yourself" and extends to do it yourself. DIY was originally a verb phrase, often used as an adjective, meaning "self-help", and later it was changed to "hell" through the Internet, such as hell cake. After the concept of DIY was formed, a related peripheral industry gradually emerged, and more and more people began to think about how to integrate DIY into their lives. DIY computer saves some expenses for users to a certain extent, and at the same time increases the freedom of configuration choice for users.