Paired build · data reviewed 2026-11-10
The last-generation flagship pair. Gaming uses the 125 W base power. The ceiling uses the 253 W turbo limit.
Gaming total 632 W. Minimum 850 W. Efficiency size 1,300 W. If both parts sit on their limits, the load is 760 W and the minimum becomes 1,000 W.
These open a store search for that wattage class. Prices stay on the store. Disclaimer.
| Line | Watts | Why this figure |
|---|---|---|
| Core i9-14900K | 125 W | Processor Base Power 125 W, Maximum Turbo Power 253 W |
| GeForce RTX 4090 | 450 W | Total Graphics Power 450 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. |
Core i9-14900K base power is 125 W and the package limit is 253 W (published).GeForce RTX 4090 board power is 450 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 5900X. Power requirements can differ with the rest of the system.
WattWise's minimum for the gaming estimate is 850 W. The vendor figure is 0 W the same.Their number is still only a minimum for the PC they named.
GeForce RTX 4090 is rated 450 W. 1× 450W or greater PCIe Gen 5 (12VHPWR) 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 12VHPWR 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: 760 W, minimum 1,000 W, efficiency size 1,600 W. That row is a combined render, not a typical game.