GeForce RTX 30 · Ampere · data reviewed 2026-11-10
What PSU for the GeForce RTX 3090 Ti?
With a Ryzen 7 9800X3D, two DDR5 sticks, one NVMe drive, and three fans, WattWise estimates 627 W continuous while gaming. The minimum size is 850 W. The efficiency size is 1,300 W.NVIDIA's published system minimum is 850 W.
These open a store search for that wattage class. Prices stay on the store. Disclaimer.
Three CPU pairings
Same platform each time: two memory modules of the CPU's generation, one NVMe drive, three fans, no pump. Gaming uses the CPU's base power. The ceiling puts the CPU on its package limit and the GPU on rated board power.
| CPU | Gaming load | Minimum | Efficiency size | Both at the limit |
|---|---|---|---|---|
| Ryzen 5 9600X a 65 W six-core gaming CPU | 572 W | 750 W | 1,200 W | 595 W · 750 W |
| Ryzen 7 9800X3D the current 120 W gaming CPU most builds are compared against | 627 W | 850 W | 1,300 W | 669 W · 850 W |
| Ryzen 9 9950X a 170 W sixteen-core CPU at its stock 200 W package limit when both are maxed | 677 W | 850 W | 1,500 W | 707 W · 1,000 W |
Connectors and spikes
24 GB GDDR6X. Graphics Card Power: 450 W, from the vendor. These figures are the reference design. A partner card can raise the power limit and change the plug.
GeForce RTX 3090 Ti is rated 450 W. 1× 450W or greater PCIe Gen 5 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.
The vendor does not publish a separate in-game average. The gaming estimate uses rated board power.
NVIDIA's required system power is based on a PC configured with a Core i9-10900K. A lower rating may work depending on the system. The Core i9-10900K is an older reference system. Treat the figure as NVIDIA's floor for that PC.
Questions this card actually raises
What PSU do I need for a GeForce RTX 3090 Ti with a Ryzen 7 9800X3D?
With 2× DDR5, one NVMe drive, and three fans, WattWise estimates 627 W continuous while gaming. The minimum size for that estimate is 850 W. The efficiency size, near 50% load, is 1,300 W. If the CPU and GPU both hit their power limits together, the load is 669 W and the minimum size is 850 W.
Which power connectors does the GeForce RTX 3090 Ti reference design use?
1× 450W or greater PCIe Gen 5 cable, or 3× 8-pin via the included adapter. GeForce RTX 3090 Ti is rated 450 W. 1× 450W or greater PCIe Gen 5 cable, or 3× 8-pin via the included adapter. The connector budget covers the rated board power.
Why is the vendor PSU number different from WattWise for the GeForce RTX 3090 Ti?
NVIDIA publishes a system minimum of 850 W. NVIDIA's required system power is based on a PC configured with a Core i9-10900K. A lower rating may work depending on the system. The Core i9-10900K is an older reference system. Treat the figure as NVIDIA's floor for that PC.
Do transient spikes mean I should double the PSU for a GeForce RTX 3090 Ti?
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.