Radeon RX 6000 · RDNA 2 · data reviewed 2026-11-10
What PSU for the Radeon RX 6900 XT?
With a Ryzen 7 9800X3D, two DDR5 sticks, one NVMe drive, and three fans, WattWise estimates 477 W continuous while gaming. The minimum size is 600 W. The efficiency size is 1,000 W.AMD'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 | 422 W | 550 W | 850 W | 445 W · 600 W |
| Ryzen 7 9800X3D the current 120 W gaming CPU most builds are compared against | 477 W | 600 W | 1,000 W | 519 W · 650 W |
| Ryzen 9 9950X a 170 W sixteen-core CPU at its stock 200 W package limit when both are maxed | 527 W | 700 W | 1,200 W | 557 W · 700 W |
Connectors and spikes
16 GB GDDR6. Typical Board Power: 300 W, from the vendor. These figures are the reference design. A partner card can raise the power limit and change the plug.
Radeon RX 6900 XT is rated 300 W. 2× 8-pin. 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.
The vendor does not publish a separate in-game average. The gaming estimate uses rated board power.
AMD publishes this minimum on the product page and does not name the reference CPU in the specification block we transcribed.
Questions this card actually raises
What PSU do I need for a Radeon RX 6900 XT with a Ryzen 7 9800X3D?
With 2× DDR5, one NVMe drive, and three fans, WattWise estimates 477 W continuous while gaming. The minimum size for that estimate is 600 W. The efficiency size, near 50% load, is 1,000 W. If the CPU and GPU both hit their power limits together, the load is 519 W and the minimum size is 650 W.
Which power connectors does the Radeon RX 6900 XT reference design use?
2× 8-pin. Radeon RX 6900 XT is rated 300 W. 2× 8-pin. The connector budget covers the rated board power.
Why is the vendor PSU number different from WattWise for the Radeon RX 6900 XT?
AMD publishes a system minimum of 850 W. AMD publishes this minimum on the product page and does not name the reference CPU in the specification block we transcribed.
Do transient spikes mean I should double the PSU for a Radeon RX 6900 XT?
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.
Sources
Nearby cards
- Radeon RX 6950 XT — 335 W typical board power
- Radeon RX 6800 XT — 300 W typical board power