Let's estimate for a theoretical gaming PC:

Focus on sustained load . Your PSU is happiest at 40–60% load (fan stays quiet, efficiency peaks). Oversizing slightly gives you silence, longevity, and safety.

Modern graphics cards (GPUs) can experience sudden, brief power surges that exceed their rated wattage. An estimator helps you build in the "headroom" necessary to absorb these spikes without tripping safety protections. How PSU Estimators Calculate Your Needs

Here’s the truth about PSU estimators:

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