Which power supply for an RTX 5070, 5070 Ti, 5080 or 5090 in 2026?

You’re building around an RTX 5070, 5070 Ti, 5080 or 5090 and wondering which power supply to buy. The number on the box matters — but in 2026, transient spikes and the 12V-2x6 connector matter just as much. A PSU sized right at the TGP, or a dodgy 8-pin adapter, and you end up with OPP shutdowns or a connector that runs hot.

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This guide is organized by GPU (search intent: “RTX 5090 / 5080 / 5070 Ti power supply”). For generic wattage sizing across all builds, see our PC power supply buying guide — that’s where the general “850W power supply” question lives.

NVIDIA baseline (Required System Power, with a Ryzen 9 9950X-class CPU): 5070 → 650 W (TGP 250 W) · 5070 Ti → 750 W (300 W) · 5080 → 850 W (360 W) · 5090 → 1000 W (575 W, PCIe CEM 5.1 PSU). Materiel-Gamer and Tom’s Hardware often add one extra comfort step (up to 1200 W for a 5090 with a power-hungry CPU or an overclocked custom card).

The ATX 3.1 spec requires PSUs to absorb power excursions (up to ~2× rated output for very short spikes) and standardizes the 12V-2x6 connector (a safer revision of the original 12VHPWR). DropReference rule: use the native 16-pin cable that ships with the PSU, seated all the way in, with no sketchy third-party “Y” adapter.

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• Gigabyte P650G PG5 — ATX 3.1 / PCIe 5.1 per manufacturer / DR spec sheet.
• MSI MAG A750GL PCIE5 — MSI lists it as ATX 3.1 ready / PCIe 5.1; the Amazon.fr listing may still say “ATX 3.0”, so we go with MSI’s spec sheet.
• Corsair RM850e (2025) — ATX 3.1 certified, native 600 W 12V-2x6 cable.
• MSI MPG A850GS PCIE5 — ATX 3.1 / PCIe 5.1 (listing + spec sheet).
• be quiet! Pure Power 13 M 1000 W — ATX 3.1 (DR product sheet).
• ASUS ROG Strix 1200P — ATX 3.1, native 600 W 12V-2x6 (ROG specs).

80+ Gold minimum for a 2026 gaming PC; Platinum is welcome at 1000–1200 W if you stream or overclock. Efficiency peaks around 50–60% load: oversizing to 1600 W “for later” costs a lot for little gain.

NVIDIA quotes 650 W of system power for a 5070 (TGP 250 W). That’s enough for a mid-range or upper-mid Ryzen that isn’t extreme. If you run a 9950X plus several SSDs and RGB, step up to the 750 W tier instead.

The RTX 5070 Ti needs 750 W of system power (TGP 300 W). It’s the 2026 upper-mid sweet spot: enough for the Ti, and you can often reuse the PSU if you move to a 5080 later (otherwise aim for 850 W right away).

For the RTX 5080, NVIDIA targets 850 W (TGP 360 W). Two catalog picks at this tier: the Corsair RM850e (often the most clicked) and the MSI MPG A850GS. If you stream in 4K with a high-end CPU, the 1000 W comfort step keeps you away from the limit.

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The RTX 5090 (TGP 575 W) is in a different league. NVIDIA: 1000 W minimum. Materiel-Gamer and Tom’s Hardware: 1200 W as soon as you add a high-end CPU or an overclocked custom card, or want headroom instead of running at the ceiling. Here the native 12V-2x6 cable isn’t optional.

• Wattage — meet NVIDIA’s minimum, add one step for a hungry CPU, an overclocked custom card or streaming.
• ATX 3.1 + native 12V-2x6 — a priority from the 5070 Ti / 5080 / 5090 up.
• No sketchy third-party adapters — use the supplied cable, pushed in until it clicks.
• 80+ Gold minimum — Platinum welcome at 1000–1200 W.
• Modularity — fully modular makes cable management easier.

Is 750 W enough for a 5070 Ti?

Yes for the reference model (NVIDIA’s recommendation). Go 850 W for a heavily overclocked custom card or a 9950X-class CPU with lots of peripherals.

Do you need 1200 W for a 5080?

No: 850 W is NVIDIA’s recommendation. 1000 W is comfort. Keep 1200 W mainly for the 5090.

Is ATX 3.0 still OK in 2026?

Yes, if the unit is good quality and has a 16-pin connector. At the same price, take ATX 3.1 (revised 12V-2x6).

In 2026, size your PSU by GPU: 650 / 750 / 850 / 1000 W from the 5070 to the 5090, with one comfort step if your build already pulls hard on the CPU side. The blocks above are live DropReference picks (US prices from US catalog listings, October 7, 2026) on exact, verified Amazon.fr ASINs. For the rest of the decision (brand, noise, case), read our PC power supply guide.