PC Power-Supply Estimator
Estimate sustained load, GPU transient allowance, configurable headroom, capacity tier, utilization, wall draw, and connector-planning notes.
Build an estimate from visible assumptions
Enter realistic CPU, GPU, and remaining-system loads. Adjust the GPU transient factor, headroom, and efficiency instead of accepting a hidden score.
Sustained, transient, and capacity result
- Sustained component load
- — CPU + GPU + remaining system
- Transient envelope
- — GPU factor applied to the entered GPU load
- Headroom target
- — Sustained load plus selected margin
- Recommended capacity tier
- — Higher envelope rounded up to 50 W
- Sustained utilization
- — At the recommended capacity tier
- Estimated wall draw
- — Uses the selected efficiency assumption
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Copy the estimate
Calculating…
Capacity is only one requirement
- Verify the GPU and CPU manufacturer recommendations.
- Confirm connector type, cable count, and whether adapters are permitted.
- Check case fit, PSU form factor, cable length, fan orientation, and ventilation.
- Review protection design, warranty, platform quality, and independent electrical testing.
- 80 PLUS describes tested efficiency, not every aspect of build quality.
PC performance and power resources
Use the estimate with the PSU-selection guide, build guide, first-boot checklist, stutter workflow, and frame-time tools below.
A repeatable frame-time workflow for separating shader compilation, traversal, CPU, GPU, VRAM, storage, thermal, power, and stability causes.
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TechnologyFrame Time vs FPS ExplainedConvert frame rate into delivery time and interpret averages, lows, spikes, refresh budgets, caps, and generated-frame figures correctly.
GuideHow to Choose a PC Power SupplyChoose capacity, connectors, ATX support, protection, efficiency, physical format, and cable layout around the hardware you will actually run.
GuideFirst Gaming PC Boot and Troubleshooting GuideVerify POST, firmware, memory, Windows, drivers, temperatures, and staged stability before treating every symptom as a game problem.
TechnologyWhy PC Games Compile ShadersLearn why pipeline creation and cache population can cause first-encounter hitches, and what a second traversal can reveal.
TechnologyDLSS, FSR, XeSS, and Frame Generation ExplainedSeparate internal render resolution, reconstruction, generated frames, latency, and base-frame stability before comparing performance modes.
GearThe Ultimate Beginner’s Guide to Building Your First Gaming PCPlan compatible components, assembly, cooling, storage, graphics, power, and the first boot as one complete system.