As the main heart of the host system, the power supply provides a stable and stable "blood" for the stable operation of the various components of the host. When we purchase the power supply, we usually only pay attention to the power rating, brand, price, certification specifications and other aspects of the power supply. However, as a research-oriented problem, when faced with a power supply, always look at the simple and complicated digital form on the nameplate from time to time? What does +3.3V mean? What is the difference between +12V and -12V? Why do we value +12V so much? In fact, the voltage value of this series is the power output of each power supply.
+3.3V, +5V, +12V, -12V, +5Vsb How much do you know?
At present, the mainstream power supply output, including +3.3V, +5V, +12V, -12V, +5Vsb and so on. As for the 5V output that has been around for a long time and has long since disappeared, it is not discussed today.
First, let's take a look at the 24-pin definition of the power supply connection board. You can see the output of various voltages of the power supply.
+3.3V:
ATX version
+3.3V is the product of Intel's guidance. Why do you say this way? This has to go back to the PenTIum II twenty years ago. Before PII, the minimum voltage supplied by the power system was +5V, which was provided to the motherboard, CPU, memory, various boards, and so on. But as CPU performance increases, the +5V standard brings a lot of power to the CPU. In order to reduce energy consumption, Intel modified the CPU voltage specification in the ATX standard at that time and dropped it to 3.3V.
The typical application of 3.3V is in the old PCI slot.
In order to reduce the heat generated by the motherboard and save energy, the current power supply directly supplies 3.3V. Nowadays, the output division of each power supply is very clear. The 3.3V standard is divided into other outputs, mainly the power supply of the motherboard itself, memory, and other PCI devices such as independent Debug cards.
+5V:
The SSD supply voltage is 5V, the same as +5V
+5V output, although this standard has a long history, it is actually a product abandoned by history. With the increasing power of CPUs and graphics cards, +5V can't satisfy their appetite. Therefore, the current power supply standard distribution of +5V only leaves the control circuit of the disk drive and the non-motor part of the optical drive. Nowadays, SSD is very popular. Since SSD is a non-mechanical design, the role of +5V has been re-emphasized. We have seen that the default voltage of SSD is now 5V, which confirms this theory. In addition, on some motherboards, +5V also supports power to USB.
+12V:
+12V is the most important power supply output voltage in the current power system, and the video card is one of the beneficiaries.
+12V is the most important power supply output voltage in current power systems. The power supply for the CPU and graphics card is from the +12V road. At the same time, the motor part of the mechanical hard disk, optical drive and other mechanical hardware is also powered by +12V to meet the demand of 7,200 rpm.
The nameplate shows whether your power supply is single or dual +12V
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