What power supply do you need for the RTX 4080?
The GeForce RTX 4080 is rated at 320 W total board power. That's 35 W more than the RTX 4070 Ti 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 4080 draws about 457 W while gaming and up to 564 W under full load. GPU spikes can briefly reach about 692 W, so choose an ATX 3.1 unit rated 80+ Gold or better.
RTX 4080 PSU size by CPU
| Build | CPU | Gaming draw | Minimum | Recommended |
|---|---|---|---|---|
| Budget | Ryzen 5 7600 | 434 W | 650 W | 650 W |
| Gaming | Ryzen 7 9800X3D | 457 W | 650 W | 750 W |
| High-end | Core i9-14900K | 522 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 RTX 4080
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 4080 power specs
| Total board power | 320 W |
|---|---|
| Estimated ms-level spike | ≈ 448 W |
| Power connectors | Usually 1× 12V-2x6 (16-pin) cable. A native PSU cable is safer than adapters; some partner cards use 2× 8-pin instead. |
| Recommended PSU (pre-ATX 3.0 unit) | 750 W |
| Estimated running cost | ≈ $10.43/month (3 h/day at $0.18/kWh) |
Frequently asked questions
Is 450W enough for the RTX 4080?
No. With a typical gaming CPU, the RTX 4080 can push a 450 W PSU past its safe limit (about 125% at full load). Get at least 650 W, ideally 750 W.
Is 550W enough for the RTX 4080?
No. With a typical gaming CPU, the RTX 4080 can push a 550 W PSU past its safe limit (about 103% at full load). Get at least 650 W, ideally 750 W.
Is 650W enough for the RTX 4080?
It can work, but it's tight. A full-load stress test would push a 650 W unit to about 87% of its rating. We recommend 750 W for quieter, safer operation.
Is 750W enough for the RTX 4080?
Yes. A quality 750 W ATX 3.x power supply runs the RTX 4080 with a typical gaming CPU at about 61% load while gaming.
Is 850W enough for the RTX 4080?
Yes. A quality 850 W ATX 3.x power supply runs the RTX 4080 with a typical gaming CPU at about 54% load while gaming.
What power connector does the RTX 4080 use?
Usually 1× 12V-2x6 (16-pin) cable. A native PSU cable is safer than adapters; some partner cards use 2× 8-pin instead.