Find the exact power supply wattage your PC needs, with safe headroom.
Recommended PSU
get a quality unit rated at least this high
Idle draw
Peak draw
PSU class
Select your processor to include its typical power draw (TDP).
Select your graphics card — the single biggest consumer in a gaming PC.
Include RAM, storage drives, fans, RGB and USB devices, plus any overclocking.
Graphics cards draw far more power in short bursts than their rated TDP — an RTX 4090 can spike past 600W for a few milliseconds. A quality PSU with 20-30% headroom absorbs these spikes safely, keeps fans quiet and leaves room for future upgrades.
Once you know the wattage, pick a unit from a reputable brand with an 80 PLUS Bronze or better rating and the right modular cables for your build. Never cheap out on the power supply — it protects every other component in your PC.
No. A far larger PSU than needed is wasteful and runs less efficiently. The sweet spot is a unit rated for about 20-30% more than your peak draw, which is exactly what this calculator recommends.
Yes. Overclocking raises both CPU and GPU power draw. Use the overclock slider to add the correct buffer.
80 PLUS Bronze, Silver, Gold, Platinum and Titanium rate how efficiently the PSU converts AC to DC. Efficiency affects running cost and heat, not the wattage you need.
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