What power supply do you need for the RX 7900 GRE?
The Radeon RX 7900 GRE is rated at 260 W total board power. That's 3 W less than the RX 7800 XT. Here's the PSU size we recommend, the bare minimum, and what to buy.
With a typical gaming CPU (Ryzen 7 9800X3D), the RX 7900 GRE draws about 403 W while gaming and up to 504 W under full load. GPU spikes can briefly reach about 634 W, so choose an ATX 3.1 unit rated 80+ Gold or better.
RX 7900 GRE PSU size by CPU
| Build | CPU | Gaming draw | Minimum | Recommended |
|---|---|---|---|---|
| Budget | Ryzen 5 7600 | 380 W | 550 W | 650 W |
| Gaming | Ryzen 7 9800X3D | 403 W | 650 W | 650 W |
| High-end | Core i9-14900K | 468 W | 750 W | 850 W |
Assumes 2 memory sticks, 1 NVMe SSD, air cooling and 3 fans, with no overclocking. Using a different CPU? Calculate your exact build.
Best power supplies for the RX 7900 GRE
Our 650 W picks. Every one is a fully modular, 80+ Gold or better unit from a brand with a strong reliability record.
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RX 7900 GRE power specs
| Total board power | 260 W |
|---|---|
| Estimated ms-level spike | ≈ 390 W |
| Power connectors | Needs about 2× 8-pin PCIe cables (use separate cables, not one daisy-chained cable, when you can). |
| Recommended PSU (pre-ATX 3.0 unit) | 650 W |
| Estimated running cost | ≈ $9.45/month (3 h/day at $0.18/kWh) |
Frequently asked questions
Is 450W enough for the RX 7900 GRE?
No. With a typical gaming CPU, the RX 7900 GRE can push a 450 W PSU past its safe limit (about 112% at full load). Get at least 650 W, ideally 650 W.
Is 550W enough for the RX 7900 GRE?
It can work, but it's tight. A full-load stress test would push a 550 W unit to about 92% of its rating. We recommend 650 W for quieter, safer operation.
Is 650W enough for the RX 7900 GRE?
Yes. A quality 650 W ATX 3.x power supply runs the RX 7900 GRE with a typical gaming CPU at about 62% load while gaming.
Is 750W enough for the RX 7900 GRE?
Yes. A quality 750 W ATX 3.x power supply runs the RX 7900 GRE with a typical gaming CPU at about 54% load while gaming.
Is 850W enough for the RX 7900 GRE?
Yes. A quality 850 W ATX 3.x power supply runs the RX 7900 GRE with a typical gaming CPU at about 47% load while gaming.
What power connector does the RX 7900 GRE use?
Needs about 2× 8-pin PCIe cables (use separate cables, not one daisy-chained cable, when you can).
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