When most people choose DIY accessories, the focus is on the main components of CPUs and graphics cards, and the power supply is often ignored.
The power supply, as the heart of the entire computer, is responsible for providing power to the various hardware. Selecting a good, suitable power supply will play a key role in the stability and performance of the computer's overall performance. Therefore, power supply selection cannot be underestimated.
First, view the power nameplate
The power nameplate has a lot of key information on the power supply. Let's first explain the meaning of these numbers:
AC input: The operating voltage is 100v-240v, indicating that this is a wide-range power supply, and the voltage instability area can also be used normally.
DC output:
1, +12V output is divided into V1 and V2, then this power is a dual 12V output. The two channels respectively supply power to the processor and graphics card. Below 18A, 17A indicates that the current limit value is 41A. Above this value, the power supply will open a breakpoint. protection.
The +12V output of the power supply is mainly responsible for the power supply of the CPU and graphics equipment. The higher the proportion of the 12v output power is, the higher the power output quality is. This means that the +12V output is a more important parameter.
2, +5v +3.3v joint output, multi-disk users need attention, mainly for hard drives, optical drives, motherboards and other equipment power supply.
3, -12v this way power is mainly used for some serial circuits; +5VSB is a standby circuit, mainly for the boot circuit and USB interface and other circuits to provide power.
Many friends will pay attention to the 80PLUS certification when they purchase power supplies. The higher the certification level, the higher the conversion rate. In actual use, it means less electricity bills. Actually, this is not a critical factor. Do not pursue it blindly. More Depends on the quality of the power supply.
Second, look at the power cable
The choice of wire for the power source is not the longer the wire, the better. The longer the wire, the lower the conversion efficiency.
At the same time, we must also pay attention to the texture of the wire and the process of the wire to see if it uses No. 16 or No. 18 wire rods. Because such wire rods have greater bearing capacity, high-quality power supply details are all in place. Also look at the interface of the power cable is not enough, so as not to affect the future upgrade.
Third, look at the size of the power fan
When the power supply is working, it will generate a certain amount of heat. If the heat dissipation performance is not good, it will affect the life span of the power supply and even the temperature inside the entire chassis, thus affecting the life of the entire host.
In the case of the same rotation speed, the larger the fan diameter, the greater the amount of air flow, the better the heat dissipation, and the smaller the fan, the faster the rotation speed in order to ensure the heat dissipation, and the noise will increase. Therefore, everyone must purchase it when purchasing. Large diameter fan power supply.
With the development of power supply, some power supplies already have intelligent temperature control systems. The power supply fan can adjust the speed of the power supply according to the actual heat used. The higher the power conversion efficiency, the lower the heat output.
Fourth, look at the internal components of the power supply
The power supply has a precise internal structure. For the average consumer, it is not necessary to clarify the functions and working principles of each component. The following are the key points:
1. PFC: The power supply has passive PFC and active PFC. The active PFC is difficult to design and has high production cost. However, its conversion efficiency is high. It is the current mainstream application. The passive PFC uses the inductance compensation method, which is relatively stable but has a high fever. , It tends to be eliminated.
2. Capacitance: The quality of the capacitor affects the service life of the entire power supply. High-temperature resistant solid capacitors are more stable and durable during actual use. They are not prone to bursting.
3, PCB board: PCB board quality also affects the power supply is durable and can withstand high-intensity current, the amount of tin on the PCB copper layer and the amount of copper, copper thickness affect PCB quality.
Fifth, select the power form
There are three types of power: non-module, half module and module power supply. The output wire of non-module power supply is fixed to the power supply, and the quantity of wire can't be changed at the same time.
The power of the half module is fixed by some wires, and there will also be some module wire interfaces: All the wires and power of the module power can be separated to increase the expansion capacity, while the unused wires can also be not inserted, saving internal space. According to different users Different needs to choose.
Understanding that these are basically enough to refer to the choice of power supply
