I've been using the same PC build for several years and recently upgraded the graphics card to an ASUS TUF RTX 5080 for a newer 49-inch monitor. My current power supply is a Corsair RM750x White (2018), and the GPU came with an adapter for its newer power connector. That has me wondering whether I should replace the PSU rather than rely on the adapter. Would a quality 850W unit be sufficient for the 5080 if I'm not planning to overclock, or would upgrading to 1000W be the better long-term choice? I'd also appreciate recommendations for reliable models with a native 12V-2x6 cable.
4 Answers
A Corsair RM1000x would be a straightforward option. The newer ATX 3.1 version includes a native 12V-2x6 cable, so you won’t need to depend on the adapter. The RMx line is more expensive than some alternatives, but it’s a solid unit you likely won’t need to replace again for a while.
Look for an ATX 3.1 PSU with a strong rating on a reputable PSU tier list. Good alternatives mentioned include the Seasonic Focus GX 1000, Super Flower Leadex VIII 1000W or 1200W, and NZXT C1000 Gold. A 1000W model is a sensible sweet spot if it isn’t significantly more expensive than 850W.
Before buying a new PSU, check whether your current RM750x is compatible with a proper manufacturer-made 12V-2x6 cable. A suitable Corsair cable may be enough if the rest of the system’s power requirements are reasonable, but make sure the cable is designed for that exact PSU cable type and never mix modular cables between brands or incompatible models.
NVIDIA’s recommended minimum is 850W, and several people are running a 5080 without problems on a good 850W unit, even with high-end CPUs. So 850W can work if the PSU is modern and high quality. That said, 1000W gives you more headroom and is probably the better choice if the price difference is reasonable, especially for a long-term upgrade.
That’s a good point. I’ll check cable compatibility first, but I’m leaning toward a newer 1000W ATX 3.1 unit for the extra headroom and native connector.