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PC PSU Calculator, Bottleneck & Gaming FPS Estimator.

Loaded with official component parameters for precise PSU sizing, bottleneck analysis, and gaming frames.

Hardware Selection

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Recommended PSU (Gaming)
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Est. System Draw
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Top PSU Matches (Amazon Affiliate)

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Select components to analyze ATX 3.1 excursion safety and bottleneck ratios.

*Note: Calculations sum each component's manufacturer-rated sustained power draw (GPU TGP/TBP always at full rating; CPU PL2/MTP/PPT scaled to ~70% in Gaming mode, full in Worst-Case mode) plus a fixed overhead allowance, then target ~70% PSU load for headroom. Results are estimates — actual draw varies with silicon quality, ambient temperature, and overclocking.

Gaming FPS Estimate

Modeled estimate based on GPU/CPU tier synergy, weighted per-title for how GPU-bound or CPU-bound each game typically is. High/Ultra settings, DLSS/FSR off. Treat as a ballpark, not a lab benchmark — actual results depend on drivers, game patches, and settings.

Awaiting CPU & GPU selection...
⚡ Wattbench Estimation Engine — modeled, not scraped from live benchmarks. See methodology note below.

Your Field Notes

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PC Power Supply & FPS Calculation Guide

How does Wattbench calculate recommended PSU wattage?

We sum the real rated power draw of every component you select — CPU PL2/MTP or PPT, GPU TGP/TBP, motherboard, RAM, cooling, and storage — plus a small fixed overhead for fans and peripherals. The recommended PSU size targets roughly 70% load at that peak, which lines up with standard PSU efficiency-curve guidance and matches published real-world PSU recommendations we cross-checked our numbers against.

Why do GPU transient spikes matter?

Modern high-end graphics cards can briefly draw far more than their rated power for a fraction of a second. Under the ATX 3.0/3.1 and PCIe CEM 5.1 specs, PSUs with a native 12VHPWR/12V-2x6 connector are built with the capacitance to absorb these spikes internally. That means the fix is buying a compliant PSU and seating the cable properly — not simply buying a bigger number.

How accurate are the gaming FPS estimates?

Each title is modeled with its own GPU-bound/CPU-bound weighting (for example Valorant leans CPU-bound, Cyberpunk 2077 at Ultra leans GPU-bound) and calibrated against published benchmark reference points. This is a calibrated estimate for ballpark planning, not a live per-title benchmark database — treat exact numbers as directional.

How often is hardware data updated?

Our component database targets a bi-monthly refresh as new desktop parts and PSU revisions launch. CPU power figures for 6th-9th gen Intel parts are derived from a documented methodology (a TDP-based multiplier, explained in the codebase) rather than a single disputed spec number, since independent testing sources disagree on real PL2 values for that era.