Eli5 techy: online calculator recommends 400W of power supply, but VGA recommends 650W, is there a problem going below recommended?

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I’m about to upgrade my desktop computer. Using an online calculator and adding my components, it recommends a bit more than 200W of power. When I replace the VGA with the one that I want, it recommends 400W power. But when checking the VGA alone, it’s store page says: power supply 650W or more recommended.

My question is, I already have a 450W power supply, can I go with it? And what happens if the power is not enough? Will I risk any component?

Obs: Perhaps the calculator specifies raw energy, while the power supplies can deliver like 80% of what they say?

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15 Answers

Anonymous 0 Comments

In a worse case scenario, it will explode because it had a bad fuse. In the best case, the PC will shut off because it doesn’t have enough power. The recommendation is what the computer needs to function, not what it will require while you’re using it. Intense tasks and long-term use will make it heat up, which makes it draw more power, both to cool itself and because it’s using more resources, and because heat changes conductivity.

Always go well above the recommended but stay within your budget, no need to say, jump to 800w.

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