What power supply do you need for the RTX 3090?
The GeForce RTX 3090 is rated at 350 W total board power. That's 0 W more than the RTX 3080 Ti. Here's the PSU size we recommend, the bare minimum, and what to buy.
With a typical gaming CPU (Ryzen 7 9800X3D), the RTX 3090 draws about 484 W while gaming and up to 594 W under full load. GPU spikes can briefly reach about 874 W, so choose an ATX 3.1 unit rated 80+ Gold or better.
RTX 3090 PSU size by CPU
| Build | CPU | Gaming draw | Minimum | Recommended |
|---|---|---|---|---|
| Budget | Ryzen 5 7600 | 461 W | 650 W | 750 W |
| Gaming | Ryzen 7 9800X3D | 484 W | 750 W | 750 W |
| High-end | Core i9-14900K | 549 W | 850 W | 1000 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 RTX 3090
Our 750 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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RTX 3090 power specs
| Total board power | 350 W |
|---|---|
| Estimated ms-level spike | ≈ 630 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) | 850 W |
| Estimated running cost | ≈ $10.92/month (3 h/day at $0.18/kWh) |
Frequently asked questions
Is 550W enough for the RTX 3090?
No. With a typical gaming CPU, the RTX 3090 can push a 550 W PSU past its safe limit (about 108% at full load). Get at least 750 W, ideally 750 W.
Is 650W enough for the RTX 3090?
It can work, but it's tight. A full-load stress test would push a 650 W unit to about 91% of its rating. We recommend 750 W for quieter, safer operation.
Is 750W enough for the RTX 3090?
Yes. A quality 750 W ATX 3.x power supply runs the RTX 3090 with a typical gaming CPU at about 65% load while gaming.
Is 850W enough for the RTX 3090?
Yes. A quality 850 W ATX 3.x power supply runs the RTX 3090 with a typical gaming CPU at about 57% load while gaming.
What power connector does the RTX 3090 use?
Needs about 2× 8-pin PCIe cables (use separate cables, not one daisy-chained cable, when you can).
Can I use an older PSU with the RTX 3090?
Yes, if it's large enough. Power supplies made before ATX 3.0 handle this card's millisecond power spikes less well, so use at least 850 W with an older unit.