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Getting a layman to add those numbers is virtually impossible for a majority. Simpler to tell him he needs a 600+ watt supply and sell him an 800 watt supply for a computer that never consumes even 300 watts.
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No adding required,
just go here, or to any other the other power calculators on the net, googlable with the phrase "pc power supply calculator".
Putting in the chosen components, allowing 3 high-performance fans and 3 USB power drawn devices (conservative in this day of USB charging), and with a 20% figure for capacitor aging, and overclocking a bit, the Thermaltake calculator says
476W is advised. We are giving headroom for additional components/USB charging and for enough amperage on the +12V rails.
Y'ever look at a video card in the last five years tw? They are massive. Take up more space than any other component and have their own dedicated rail. They are often as powerful and have as much memory as the motherboard. That's why it's a gaming rig, the type that HP/Dell generally do not sell.