Is an 850W ATX 3.1 Gold PSU enough for an RTX 5080 and Ryzen 7 9800X3D?

Yes, 850W should be enough for that combination. The RTX 5080 is rated around 360W and the 9800X3D around 120W, so even with the motherboard, storage, fans, and other components, the system should generally stay well below 850W unless you’re doing heavy overclocking.

ATX 3.1 is a good choice because the standard includes requirements for handling short power spikes, and newer units commonly use the improved 12V-2x6 connector. You shouldn’t need to automatically add a huge extra wattage buffer if the PSU is a reputable ATX 3.1 model.

For a normal, non-overclocked build, 850W is plenty of headroom. Before buying, enter all your parts—including drives, fans, and any add-in cards—into a reputable power calculator, then verify that the specific PSU has strong independent testing results.

The exact PSU model matters more than the wattage or the Gold label. Gold only describes efficiency, not overall build quality. Check the manufacturer, platform, protections, reviews, and whether it has a proper native 12V-2x6 cable for the graphics card.