01
Published limits, named profiles
Gaming plans the CPU at its base power and the GPU at rated board power. The power-limit profile puts both on their ceilings. Nothing in between is pretended to be a lab trace.
Wraith Labs Studios · free power tools
Know the wattage before you buy the supply.
OuterVision's PSU calculator went offline in 2025. The brand calculators that filled the gap are shopping tools: they round you toward a unit they sell. WattWise adds the published limits, keeps spikes in the connector spec, and shows a minimum beside an efficiency size.
Five tools, one set of specs
54 desktop GPUs and 51 desktop CPUs, reviewed 2026-11-10. Every wattage on a part page is cited.
PSU wattage
Basic picks for a normal build. Expert adds utilization, offsets, RGB, USB, and the power-limit ceiling.
Calculate a supplyWhat PSU for this GPU?
A page per card: three CPU pairings, the connector budget, and the vendor's own system minimum when they publish one.
Browse GPUsElectricity cost
Hours, load, and a rate. US state averages are the EIA residential table for August 2026, or type your own.
Price a kilowatt-hour80 PLUS payback
White through Titanium at your load. You enter the price gap. The site never invents a shelf price.
Compare tiersUPS runtime
Battery watt-hours, inverter efficiency, and the VA the PC actually asks for.
Estimate runtimeHow a recommendation is made
02
Two sizes, not one padded number
The minimum keeps the estimate at or under 80% of the label. The efficiency size aims near 50%, where 80 PLUS measures its best point. The vendor's system minimum stays in its own box.
Why brand calculators run hot · What a transient spike actually requires · How much headroom is real