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PC parts for Australian builders · All prices in Australian dollars (AUD)

What power supply do I need? PSU sizing for RTX 50 and RX 9000 cards

Updated · PC Parts Australia

Short answer: start with the power supply wattage that NVIDIA or AMD recommends for your graphics card and treat it as the minimum. Go bigger if you run a high-power CPU, lots of drives and fans, or plan to upgrade the card later.

Recommended power supply by graphics card

The figures below are the manufacturers’ own numbers. Board power is what the card itself draws; the recommended PSU wattage allows for a typical CPU and the rest of the system.

Graphics card Card power Recommended PSU
GeForce RTX 5050 130W 550W
GeForce RTX 5060 145W 550W
GeForce RTX 5060 Ti (8GB or 16GB) 180W 600W
GeForce RTX 5070 250W 650W
GeForce RTX 5070 Ti 300W 750W
GeForce RTX 5080 360W 850W
GeForce RTX 5090 575W 1000W
Radeon RX 9060 XT 8GB / 16GB 150W / 160W 450W
Radeon RX 9070 GRE 220W 650W
Radeon RX 9070 220W 650W
Radeon RX 9070 XT 304W 750W

Why the recommendation is so much higher than the card

A graphics card never runs alone. The processor, motherboard, memory, SSDs, fans and USB devices all draw from the same supply. On top of that, graphics cards pull brief spikes of power well above their average draw when a game suddenly gets busier. These transients last only milliseconds, but a supply that cannot ride them out may shut the PC down mid-game.

The ATX 3.0 and ATX 3.1 standards deal with this directly: a compliant supply must handle short excursions above its rating, up to double its rated output for a tenth of a millisecond. That is one reason to choose a current ATX 3.x unit for any RTX 50 or RX 9000 build.

When to buy more than the minimum

  • A power-hungry processor. A Ryzen 7 9800X3D is rated at 120W, while Intel allows the Core Ultra 9 285K to draw up to 250W under full turbo. The bigger the CPU, the more headroom you want.
  • A future upgrade. Buying 850W today for an RTX 5070 means a later move to an RTX 5080 will not need a new supply.
  • Quieter running. Many builders size the supply so a full gaming load sits around half to two-thirds of its rating. The fan spins slower and the unit runs cooler.
  • Lots of extras. Several hard drives, a custom water loop pump, many RGB fans and powered USB devices all add up.

A worked example: an RTX 5070 with a Ryzen 7 9800X3D sits comfortably on NVIDIA’s recommended 650W. A quality 750W unit gives spare capacity for extra fans and a possible card upgrade.

Cables and connectors

Most RTX 50 cards from the 5070 up use a single 16-pin connector. The current version is called 12V-2×6; it replaced the earlier 12VHPWR design and has the same 16-pin shape. The difference is inside: the power pins are longer and the four small sense pins are shorter, so a plug that is not fully pushed in is detected instead of carrying full power through a poor contact.

  • Push the plug in until it is completely seated, with no gap between plug and socket.
  • Avoid bending the cable sharply right at the plug, and make sure nothing pulls it sideways once the side panel is on.
  • A native 16-pin cable from an ATX 3.1 supply is the neatest option. If your card came with an adapter, connect every 8-pin plug it asks for.

Most Radeon RX 9000 cards and many lower-end GeForce cards still use standard 8-pin PCIe plugs, usually two or three. Count the plugs your card needs and check the supply has that many PCIe cables. Where you can, run separate cables rather than one cable with two plugs on it.

What efficiency ratings do and do not tell you

An 80 Plus badge (Bronze, Gold, Platinum, Titanium) measures how efficiently the supply converts mains power at a few set loads. It does not measure build quality, voltage stability, ripple, protection circuits or noise. Cybenetics rates efficiency (ETA) and noise (LAMBDA) across a wider set of tests. Both are useful, but an independent review of the exact model tells you far more than the badge.

Size and cable style

Standard ATX supplies fit most cases. Small form factor builds usually need an SFX power supply; check what your mini ITX case supports. Fully modular units let you connect only the cables you use, which makes cable management and airflow easier.

Quick checklist

  1. Find your card’s recommended PSU wattage in the table above.
  2. Add headroom for a high-power CPU, extras or a future upgrade.
  3. Choose an ATX 3.x supply with a native 12V-2×6 cable for RTX 50 cards, or enough 8-pin PCIe cables for your card.
  4. Check the size (ATX or SFX) against your case.
  5. Read an independent review of the exact model.

Browse all power supplies, or read Will this graphics card fit my case? before you order a large card.

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