Tool
PSU wattage calculator
Basic mode is a CPU, a GPU, memory, storage, and cooling. Expert mode adds a gaming profile, a power-limit ceiling, and your own utilization or undervolt. The result explains the arithmetic in plain language.
Estimated continuous load
481 W
Ryzen 7 9800X3D + Radeon RX 9070 XT
On the efficiency size this estimate is 48% of the label. Power-limit ceiling: 523 W, minimum 700 W.
Where the watts go
Connectors
Radeon RX 9070 XT is rated 304 W. 2× 8-pin on AMD's baseline specification. The connector budget covers the rated board power.
This reference design uses 6-pin and 8-pin plugs, not 12V-2x6. Shop the continuous wattage. A PSU without a 12V-2x6 connector follows the lower ATX excursion column (150% for 100 µs on units at or under 450 W, and on larger units that omit the connector). That is still not a reason to double the label.
How this number was built
Gaming profile. Ryzen 7 9800X3D is planned at its default tdp of 120 W, not its 162 W PPT limit. Radeon RX 9070 XT is planned at its 304 W typical board power. The vendor does not publish a separate gaming average, so the rating is used instead of an invented one.
Platform allowances add 57 W. Estimated continuous load is 481 W.
Minimum size keeps that load at or under 80% of the label: 650 W. The efficiency size puts the same load near 50%: 1,000 W. The efficiency size is headroom for noise and the 80 PLUS sweet spot. It is not a second copy of the load.
On a 1,000 W unit this 481 W estimate is 48% of the label. The 80 PLUS Gold floor at that load is about 90% at 115 V. The certification is a floor, not the curve of a unit you have not picked.
The vendor publishes a system minimum of 750 W. AMD publishes this minimum on the product page and does not name the reference CPU in the specification block we transcribed.
AMD's public product page lists Default TDP. Stock Package Power Tracking (PPT) for this TDP class follows AMD's socket default of 1.35× TDP, rounded to the standard step (65W→88W, 105W→142W, 120W→162W, 170W→230W). PPT is a power limit, not a measurement of a game or a render.
If the CPU and GPU both sit on their power limits at the same time, the load rises to 523 W and the minimum size becomes 700 W. That overlap is uncommon in games and normal in a combined render.
These open a store search for that wattage class. Prices stay on the store. Disclaimer.
Estimates only. Use at your own risk.
Nothing you select is uploaded. Sharing copies the address bar. The methodology lists every allowance and the ATX excursion rule.