Is 650 watts enough for gaming PC?

Often, a high-quality 550, 600, or 650 watt power supply can be just the right fit. It never hurts to overbuy on power supply wattage, but it is not necessary. ... A 500 watt Tier 1 power supply could conceivably handle a high-end gaming PC, but you should not expect that to be true of a Tier 5 unit.

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