What PSU do you need for a AMD Radeon RX 7900 XTX?
The AMD Radeon RX 7900 XTX has a vendor-published board power (TGP/TBP) of about 355 W. Sizing a power supply from that figure and a typical companion system (a 125 W-class CPU plus standard ATX accessories, ~242 W), here is what we recommend.
Recommendations are planning estimates, not electrical or purchasing advice. The hardware figures behind them are vendor-published; your exact board-partner model and build can still differ.
Recommended (comfortable)
750 W
Standard headroom for transient spikes and a little future room.
Minimum
750 W
Smallest quality PSU tier we would pair with this card in a typical build.
GPU board power
355 W
Vendor TGP/TBP — a conservative ceiling, not typical gaming draw.
Vendor-recommended PSU
800 W
The wattage the GPU vendor lists — deliberately conservative.
Power connector
2× PCIe 8-pin. Use native PSU cables and confirm the layout on your exact board-partner model. See connector & ATX 3.x details →
Why 750 W for this card
The AMD Radeon RX 7900 XTX's draw is not flat. Brief spikes above the rated board power are normal, and they are short enough that a wall meter never shows them — but a power supply sitting close to its limit can trip on one. That is what the headroom in these figures is for: 355 W is the sustained ceiling, not the worst instant. This card feeds from standard PCIe connectors, so any quality supply with the right cable count works; there is no 16-pin cable to source. At 355 W a quality unit of the recommended wattage handles transients without drama; an ATX 3.x supply adds margin but is not essential. We do not publish a spike figure for the AMD Radeon RX 7900 XTX because the manufacturer does not publish one.
On the recommended 850 W supply, a Ryzen 7 9800X3D paired with the AMD Radeon RX 7900 XTX draws roughly 634 W under load — about 75% of the unit's rating. The 80 PLUS programme certifies efficiency at 20%, 50% and 100% load, and units are typically at their best around the middle of that range, so this sits in a sensible place: enough margin for transients without paying for capacity that never gets used.
The manufacturer recommends 800 W, which is 50 W above our comfortable figure of 750 W. Vendors size their guidance conservatively to cover weak supplies and heavy CPUs, so treat 800 W as the safe retail answer and 750 W as what the math supports for a typical build with a quality unit.
Pairing this card with different CPUs
The CPU does change the answer here. With a Ryzen 5 7600 this build sits on a 750 W supply, but moving to a Ryzen 7 9800X3D (162 W peak) pushes the estimate to 850 W. If you are pairing this GPU with a high-power CPU, budget for the larger unit.
| CPU | CPU peak | System load | Recommended PSU |
|---|---|---|---|
| Ryzen 5 7600 | 88 W | 560 W | 750 W |
| Ryzen 7 9800X3D | 162 W | 634 W | 850 W |
| Core i9-14900K | 253 W | 725 W | 1000 W |
Other popular choices map onto this table rather than changing it: the Ryzen 7 7800X3D has the same 162 W peak as the Ryzen 7 9800X3D, so that row applies to it unchanged; a Core i5-14600K (181 W peak) lands on the same 850 W tier as the Ryzen 7 9800X3D; a Ryzen 9 9950X (230 W peak) lands on the same 1000 W tier as the Core i9-14900K.
Assumes an ATX board, 2 RAM sticks, 1 SSD, 3 fans and a USB allowance, at the standard headroom profile. Change any of it in the calculator.
Cabling this card
This card needs 2 separate 8-pin connectors. Run a separate cable from the power supply to each connector rather than using one daisy-chained (pigtail) cable — at 355 W the split puts more current through a single cable than it is comfortable carrying. Never mix modular cables between different supplies; the PSU-side pinouts are not standardised.
Reference (MBA) design uses 2x 8-pin; some board-partner OC cards add a third 8-pin. Factory-overclocked cards from board partners can also carry a higher power limit than the reference design, so if your card advertises an OC BIOS, treat the figures here as the floor rather than the ceiling.
Want a number for your exact CPU and parts? Open the full PSU Calculator with this GPU pre-selected →
The standards behind these numbers
- How much PSU headroom do you actually need?
Why the recommendation above sits above the 355 W board power rather than on it.
- ATX 3.0 vs ATX 3.1: do you need a new PSU?
Whether an existing ATX 3.0 supply is a problem for a card in this power class.
Board-power source: AMD official specification; multi-agent web verification 2026-07-15. Last updated: 2026-07-15.
Frequently asked questions
What size PSU do I need for a AMD Radeon RX 7900 XTX?
For a typical build that pairs the AMD Radeon RX 7900 XTX (about 355 W board power) with a 125 W-class CPU and standard accessories, plan for at least a 750 W power supply. A 750 W unit gives comfortable headroom for transient spikes and future upgrades. These are estimates — verify against your exact parts.
How much power does the AMD Radeon RX 7900 XTX draw?
Its vendor-published board power (TGP/TBP) is about 355 W. That is a conservative ceiling used for PSU sizing, not the typical draw you would see while gaming.
Is a 800 W PSU enough for a AMD Radeon RX 7900 XTX?
AMD Radeon RX 7900 XTX's manufacturer lists a 800 W PSU recommendation. That figure is deliberately conservative to cover weaker units and power-hungry CPUs, so a quality 800 W supply is a safe choice. Our own estimate for a typical build is a 750 W minimum and 750 W for comfort.
Does the CPU change what PSU the AMD Radeon RX 7900 XTX needs?
Yes. With a Ryzen 5 7600 the estimate is 750 W, while a Core i9-14900K (253 W peak) takes it to 1000 W.
Why does this differ from AMD Radeon RX 7900 XTX's official PSU recommendation?
The manufacturer lists 800 W and our comfortable figure is 750 W. Vendor guidance assumes a mainstream companion system; ours adds standard headroom to a typical build. Both are shown on this page so you can judge.