When you purchase a DC computer fan, the package usually contains several essential components. Firstly, the fan itself is the core item. It comes with a set of blades attached to a motor. The blades are designed with specific shapes and angles to optimize air - flow. For example, some high - performance fans have curved blades that can generate more powerful air - movement, while still maintaining relatively low noise levels. The motor is built to be durable and efficient, capable of running continuously for long periods.

Secondly, there are mounting accessories. These typically include screws or clips. The screws are used to firmly attach the fan to the computer case. They are usually made of metal to ensure a secure fit. Clips, on the other hand, offer a more convenient and tool - free installation option. They are designed to snap onto the fan mounting points on the computer case, making the installation process quicker and easier.

In addition, many DC computer fans come with a cable. The cable is used to connect the fan to the motherboard or the power supply. For 3 - pin fans, the cable has three connectors corresponding to the power, ground, and tachometer signal pins. 4 - pin fans have an additional PWM pin for speed control, and their cables are designed accordingly. The length of the cable can vary, usually ranging from 30 centimeters to 1 meter, depending on the fan's intended use and the design of the computer case.

Some high - end DC computer fans may also include additional accessories. This could be a fan speed controller. A fan speed controller allows users to manually adjust the speed of the fan according to their needs. For example, during normal computer use, the fan can be set to a lower speed to reduce noise, while during intense gaming or CPU - intensive tasks, the speed can be increased to enhance cooling performance. There may also be thermal paste included, especially for fans that are used in combination with CPU coolers. Thermal paste helps to improve the heat transfer between the CPU and the cooler, ensuring better cooling efficiency.