Paired build · data reviewed 2026-11-10
A 360 W RTX 5080 on the same 120 W gaming CPU, which is the clean way to see what the GPU alone adds.
Gaming total 537 W. Minimum 700 W. Efficiency size 1,200 W. If both parts sit on their limits, the load is 579 W and the minimum becomes 750 W.
These open a store search for that wattage class. Prices stay on the store. Disclaimer.
| Line | Watts | Why this figure |
|---|---|---|
| Ryzen 7 9800X3D | 120 W | Default TDP 120 W, PPT 162 W |
| GeForce RTX 5080 | 360 W | Total Graphics Power 360 W |
| Motherboard allowance | 35 W | Chipset, VRM overhead, and onboard devices. |
| Memory, 2× DDR5 | 10 W | Planning allowance per module. |
| NVMe, 1 | 6 W | Active-drive allowance. |
| Fans, 3 | 6 W | Case or radiator fans. |
Ryzen 7 9800X3D base power is 120 W and the package limit is 162 W (derived).GeForce RTX 5080 board power is 360 W.NVIDIA publishes a system minimum of 850 W. NVIDIA's required system power is a minimum for a PC configured with a Ryzen 9 9950X. NVIDIA recommends a PCIe CEM 5.1 compliant PSU. Power requirements can differ with the rest of the system.
WattWise's minimum for the gaming estimate is 700 W. The vendor figure is 150 W higher.Their number is a floor for the reference PC they named. It is not added on top of ours.
GeForce RTX 5080 is rated 360 W. 1× 450W or greater PCIe Gen 5 (12V-2x6) cable, or 3× 8-pin via the included adapter. The connector budget covers the rated board power.
Do not add a second copy of the board power for spikes. Intel ATX design guide 336521, updated for PCIe CEM 5.1, requires a PSU above 450 W with a 12V-2x6 connector to hold 200% of its label for 100 µs, 180% for 1 ms, 160% for 10 ms, and 120% for 100 ms, at the duty cycles in that table. A card above 75 W may reach 3× sustained power for 100 µs or less. Use a native 12V-2x6 cable rated at least 450 W and seat it fully. Sense pins advertise 150, 300, 450, or 600 W.
Power-limit ceiling for this exact pair: 579 W, minimum 750 W, efficiency size 1,200 W. That row is a combined render, not a typical game.