GUIDE
Is 850W enough for an RTX 5080?
Yes, with most gaming CPUs, including X3D Ryzens and the i5-14600K. Go 1000W for an i7/i9 K-series or Core Ultra 7/9.
Nvidia's official minimum for the RTX 5080 is 850W, based on a test PC with a Ryzen 9 9950X. The card itself is rated at 360W. Whether 850W is comfortable depends on your CPU.
The math for common pairings
These use the same method as the calculator: card power + the CPU's stock power limit + 150W for the rest of the system, then 20% headroom, rounded up to a real PSU size. "Needed" is the total including headroom.
| CPU | CPU power | Needed | PSU |
|---|---|---|---|
| Ryzen 5 7600 | 88W | 718W | 750W |
| Ryzen 5 9600X | 88W | 718W | 750W |
| Core i5-12400F | 117W | 752W | 850W |
| Ryzen 7 7800X3D | 162W | 806W | 850W |
| Ryzen 7 9800X3D | 162W | 806W | 850W |
| Core i5-14600K | 181W | 829W | 850W |
| Ryzen 9 9950X | 200W | 852W | 1000W |
| Core Ultra 7 265K | 250W | 912W | 1000W |
| Core i7-14700K | 253W | 916W | 1000W |
| Core i9-14900K | 253W | 916W | 1000W |
The Ryzen 9 9950X comes out at 852W, just 2W over the line, so the calculator rounds up to 1000W. Nvidia's own 850W figure is based on that exact CPU, so a quality 850W unit is a reasonable call here. 1000W just keeps the full 20% headroom.
Can you get away with 750W?
With a 6-core Ryzen, the math says yes: 718W needed. It's below Nvidia's minimum, though, and a CPU upgrade later would push you over. If you're buying a new power supply anyway, the price gap between a good 750W and a good 850W unit is usually small, so 850W saves you buying twice.
Why the big Intel chips need 1000W
Intel's K-series Core i7 and i9 and the Core Ultra 7 and 9 K chips are allowed to pull about 250W at stock, and many motherboards remove that limit out of the box. Add a 360W card that spikes above its rating for milliseconds at a time, and an 850W unit ends up running close to its limit under full load. That's when PCs shut off mid-game.
Powering the 16-pin plug
The RTX 5080 uses one 16-pin 12V-2x6 plug. Nvidia lists two ways to feed it:
- A native 16-pin cable rated 450W or more, found on most ATX 3.0 and 3.1 power supplies. A 16-pin cable rated only 300W isn't enough for this card.
- The adapter in the box, plugged into three 8-pin PCIe cables. Use three separate cables from the PSU, not both ends of one split "pigtail" cable.
Some partner cards raise the power limit above 360W. If yours does, check its spec page and lean toward the bigger PSU. For seating the plug so it doesn't melt, see 12VHPWR vs 12V-2x6.
Check your exact build in the calculator