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How much power do I need to buy after building computer?
When assembling a computer, many people immediately choose a large power supply, and some even buy a 600W power supply. Of course, this does not mean that buying a high-capacity power supply is wrong. After all, a high-power power supply is a family heirloom. Money that will come out in vain is better to add to other hardware, so how to see how much power host needs?
Power depends on "nominal power". Currently, power supply ratings are typically over 200W. Then, in order to decide what power rating is needed, we must calculate approximate power consumption of corresponding host.
There are many ways to calculate power consumption of a computer. I won't mention these high tech methods. Statistical calculations are made for power consumption at. As for power consumption of each piece of iron, it should be clearly stated in instructions or on packing box for you to see for yourself, and it should be easy to add.
The following is a short list of common power consumption ranges for several types of equipment, which are not always accurate and are for reference only.
CPU: Approximately 80-150W
Graphics card: approx. 10-250W (Main display typically approx. 10W)
Hard Drive: Approximately 8-10W
Motherboard: Approx. 25-35W
Memory: Approx. 1-3W
CD-ROM drive: approx. 20W
Keyboard+mouse+fan, etc.: Approx. 15W-30W
That is, by most calculations, only about 500 watts. Of course, if you think that this is troublesome, then it can be simpler, that is, processor power + video card power + 120W.
If you need more detailed calculations, you can search Internet for power consumption calculators. There are many, but most of models are not very complete. Here I recommend Huntkey. The official website has a power consumption calculator. quite a few models, if you know best ones, share them in the comments.
For normal office computers with a primary display, a rated power supply of 300W is sufficient. If a discrete graphics card will be added, select a power supply rating of around 400W. Generally, a rated power supply of 400W is sufficient for a quad/six-core mid-range independent display, and about 500W is recommended for a mid-range and high-end six-core independent display. for some high-performance fever overclocking hosts, power supply requirements are higher.