What power supply do you need for the RTX 4090?
The GeForce RTX 4090 is rated at 450 W total board power. That's 130 W more than the RTX 4080 Super. Here's the PSU size we recommend, the bare minimum, and what to buy.
With a typical gaming CPU (Ryzen 7 9800X3D), the RTX 4090 draws about 574 W while gaming and up to 694 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 4090 PSU size by CPU
| Build | CPU | Gaming draw | Minimum | Recommended |
|---|---|---|---|---|
| Budget | Ryzen 5 7600 | 551 W | 750 W | 850 W |
| Gaming | Ryzen 7 9800X3D | 574 W | 850 W | 1000 W |
| High-end | Core i9-14900K | 639 W | 1000 W | 1200 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 4090
Our 1000 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 4090 power specs
| Total board power | 450 W |
|---|---|
| Estimated ms-level spike | ≈ 630 W |
| Power connectors | Usually 1× 12V-2x6 (16-pin) cable. A native PSU cable is safer than adapters; some partner cards use 3× 8-pin instead. |
| Recommended PSU (pre-ATX 3.0 unit) | 1000 W |
| Estimated running cost | ≈ $12.56/month (3 h/day at $0.18/kWh) |
Frequently asked questions
Is 650W enough for the RTX 4090?
No. With a typical gaming CPU, the RTX 4090 can push a 650 W PSU past its safe limit (about 107% at full load). Get at least 850 W, ideally 1000 W.
Is 750W enough for the RTX 4090?
It can work, but it's tight. A full-load stress test would push a 750 W unit to about 93% of its rating. We recommend 1000 W for quieter, safer operation.
Is 850W enough for the RTX 4090?
It can work, but it's tight. A full-load stress test would push a 850 W unit to about 82% of its rating. We recommend 1000 W for quieter, safer operation.
Is 1000W enough for the RTX 4090?
Yes. A quality 1000 W ATX 3.x power supply runs the RTX 4090 with a typical gaming CPU at about 57% load while gaming.
Is 1200W enough for the RTX 4090?
Yes. A quality 1200 W ATX 3.x power supply runs the RTX 4090 with a typical gaming CPU at about 48% load while gaming.
What power connector does the RTX 4090 use?
Usually 1× 12V-2x6 (16-pin) cable. A native PSU cable is safer than adapters; some partner cards use 3× 8-pin instead.
Already have a power supply? See every graphics card a 1000 W PSU can run →