What power supply do you need for the Arc A770?
The Arc A770 is rated at 225 W total board power. That's 0 W more than the Arc A750. Here's the PSU size we recommend, the bare minimum, and what to buy.
With a typical gaming CPU (Ryzen 7 9800X3D), the Arc A770 draws about 372 W while gaming and up to 469 W under full load. GPU spikes can briefly reach about 559 W, so choose an ATX 3.1 unit rated 80+ Gold or better.
Arc A770 PSU size by CPU
| Build | CPU | Gaming draw | Minimum | Recommended |
|---|---|---|---|---|
| Budget | Ryzen 5 7600 | 349 W | 550 W | 550 W |
| Gaming | Ryzen 7 9800X3D | 372 W | 550 W | 650 W |
| High-end | Core i9-14900K | 437 W | 650 W | 750 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 Arc A770
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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Arc A770 power specs
| Total board power | 225 W |
|---|---|
| Estimated ms-level spike | ≈ 315 W |
| Power connectors | Needs about 1× 8-pin PCIe cable (use separate cables, not one daisy-chained cable, when you can). |
| Recommended PSU (pre-ATX 3.0 unit) | 650 W |
| Estimated running cost | ≈ $8.87/month (3 h/day at $0.18/kWh) |
Frequently asked questions
Is 450W enough for the Arc A770?
No. With a typical gaming CPU, the Arc A770 can push a 450 W PSU past its safe limit (about 104% at full load). Get at least 550 W, ideally 650 W.
Is 550W enough for the Arc A770?
It can work, but it's tight. A full-load stress test would push a 550 W unit to about 85% of its rating. We recommend 650 W for quieter, safer operation.
Is 650W enough for the Arc A770?
Yes. A quality 650 W ATX 3.x power supply runs the Arc A770 with a typical gaming CPU at about 57% load while gaming.
Is 750W enough for the Arc A770?
Yes. A quality 750 W ATX 3.x power supply runs the Arc A770 with a typical gaming CPU at about 50% load while gaming.
Is 850W enough for the Arc A770?
Yes. A quality 850 W ATX 3.x power supply runs the Arc A770 with a typical gaming CPU at about 44% load while gaming.
What power connector does the Arc A770 use?
Needs about 1× 8-pin PCIe cable (use separate cables, not one daisy-chained cable, when you can).