Generally speaking, add up the full load power consumption of each accessory in the host, and then this maximum value is lower than the rated power of the power supply, and the power of the power supply should be set aside more, so that's it. In addition, the monitor is powered independently and has nothing to do with the power supply of the host, so do not count the monitor when calculating power consumption.

More professionally, it depends on whether the 12V output power of the power supply is sufficient. 12V powers the CPU and graphics card. The latter two are the two most power-consuming accessories in the host. They account for most of the host's full-load power consumption. So as long as the 12V output power of the power supply can drive the CPU and graphics card, it is almost the same. . Since the 12V output power of the power supply is lower than the rated power, only the rated power is not very safe. This is why I said above that the rated power should be reserved.

The 12V output power is better. A regular power supply will mark the 12V maximum current on the power supply nameplate. 12V multiplied by this maximum current value is the 12V output power of the power supply. For multiple 12V power supplies (the most common is dual 12V), the manufacturer must give the maximum 12V combined output current to calculate. If not, there is no good way.

Computer power supplies are now popular through the 80plus certification. The regular power supplies that pass this certification have relatively high conversion efficiency, which can save you a lot of electricity bills, and supports 100-240V full voltage, which can cope with the problem of voltage instability. If the budget is not very tight, try to choose products that have passed 80plus certification.