Radeon RX 7000 · RDNA 3 · data reviewed 2026-11-10
What PSU for the Radeon RX 7900 GRE?
With a Ryzen 7 9800X3D, two DDR5 sticks, one NVMe drive, and three fans, WattWise estimates 437 W continuous while gaming. The minimum size is 550 W. The efficiency size is 1,000 W.AMD does not publish a system minimum for this card.
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 | 382 W | 500 W | 850 W | 405 W · 550 W |
| Ryzen 7 9800X3D the current 120 W gaming CPU most builds are compared against | 437 W | 550 W | 1,000 W | 479 W · 600 W |
| Ryzen 9 9950X a 170 W sixteen-core CPU at its stock 200 W package limit when both are maxed | 487 W | 650 W | 1,000 W | 517 W · 650 W |
Connectors and spikes
16 GB GDDR6. Typical Board Power: 260 W, from the vendor. These figures are the reference design. A partner card can raise the power limit and change the plug.
Radeon RX 7900 GRE is rated 260 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's product page lists 260 W typical board power and two 8-pin connectors. It does not list a minimum power supply, so no vendor minimum is shown.
Questions this card actually raises
What PSU do I need for a Radeon RX 7900 GRE with a Ryzen 7 9800X3D?
With 2× DDR5, one NVMe drive, and three fans, WattWise estimates 437 W continuous while gaming. The minimum size for that estimate is 550 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 479 W and the minimum size is 600 W.
Which power connectors does the Radeon RX 7900 GRE reference design use?
2× 8-pin. Radeon RX 7900 GRE is rated 260 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 7900 GRE?
AMD's product page lists 260 W typical board power and two 8-pin connectors. It does not list a minimum power supply, so no vendor minimum is shown.
Do transient spikes mean I should double the PSU for a Radeon RX 7900 GRE?
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 7900 XT — 315 W typical board power
- Radeon RX 7800 XT — 263 W typical board power