How do i know what kind of power supply i will need

i have a presentation on power supplys and my question is what does the type of power supply u use depend on is it the motherboard?
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  1. No. There are two questions here: brand and power capacity. Some brands are simply better than others. A good 400 watt power supply can produce more useful power and a poor 600 watt power supply.

    Power capacity is a different matter. That depends largely upon CPU and graphics card choice. Motherboards use comparatively little power.
  2. This should answer your question:

    As you can see, all the components need power....base MoBo might draw 38 watts, CPU - 130 watts, GFX card - 200 watts ... add em up, account for loading and aging and you have a wattage req't.
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