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Best PSU for RTX 3090: RTX 3090 PSU Requirements Matched!

Get the perfect 3090 power supply with our buyer’s guide!

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Though the RTX 3090 has been superseded by the newer 4090, it remains a contemporary GPU for many PC enthusiasts – and well worth factoring into your next PC build. The best PSUs for RTX 3090 PCs not only match the 3090 PSU requirements, but give you the room for the inevitable upgrade – replacing only the GPU. And due to the 3090’s highly reasonable specifications, the best 3090 PSU options have a lot in common with the best power supply units on the market, period.

To suit as many build requirements as possible, this buyer’s guide has considered a range of factors when choosing an RTX 3090 recommended PSU. Accounting for budget, energy waste and future-proofing; our choices for the best 3090 PSU will be ideal for any PC build!

RTX 3090 PSU Requirements

The RTX 3090 power supply requirements state that it requires 750W of base power supply. This means that most contemporary PSUs are compatible with the 3090, but for the sake of longevity, we would recommend a higher-spec power supply unit. 750W is the minimum wattage, after all, and PC components are becoming more power-intensive by the day. That isn’t to say you should over-compensate by doubling your required power supply with a 1600W PSU or anything to that effect: that would certainly be overkill for a 3090 PSU. We think a decent amount of headroom is healthy, however, and our choices today for the best PSU for 3090 PCs will all be rated accordingly.

Best PSU for RTX 3090: MSI MPG A1000G

MSI MPG A1000G

Wattage

1000W

Certification

80+ Gold

Modular?

Fully Modular

ATX 3.0

Yes

Pros
  • Efficient and reliable
  • ATX 3.0 compatible
  • 10-year warranty
Cons
  • High price point

For the ideal mix of future-ready wattage and current-day reliability, the MSI MPG A1000G is the ideal choice. We crowned it our best 1000W PSU, and for good reason: with tremendous build quality and sterling wattage, this PSU is perfect for nearly all contemporary PC builds. With ATX 3.0 compatibility included as standard and a 10-year warranty, this 3090 power supply will far outlast the GPU it is paired with. Though it is a little on the pricey side when it comes to PSUs, we think the money that you’ll save on future investments makes it worthwhile. We’re happy to call the A1000G the best PSU for 3090 PC builds!

Best Budget PSU for RTX 3090: Thermaltake Toughpower GF1 850W

Thermaltake Toughpower GF1 850W 80+ Gold

Wattage

850 W

Certification

Gold

Modular?

Yes-Fully

Pros
  • Ideal wattage
  • Efficient
Cons
  • No ATX 3.0 as standard

The Thermaltake Toughpower GF1 is a sterling budget PSU for 3090 PC builds, providing ample energy and efficiency. As an 850W PSU, you are given the ideal wattage for future upgrades whilst keeping everything running smoothly and near-silently in the present. With an 80+ Gold rating, you aren’t losing money on wasted energy, making this a long-term budget PSU. However, for true future-proofing, you may have to go a little over-budget, as ATX 3.0 compatibility costs extra. That is the only real issue we have, however, and the GF1 remains a sterling budget 3090 power supply!

Best 750W PSU for RTX 3090: Corsair RM750x

Corsair RM750x

Wattage

750W

Certification

80+ Gold

Modular?

Fully

Pros
  • Barebones wattage
  • Quiet running
  • Great build quality
Cons
  • High price point

To meet the minimum 3090 PSU requirements without any fuss, the Corsair RM750x is the ideal PSU. With 750W of power, this affordable and efficient PSU is ideal for those wanting a barebones balance for their PC. The power supply unit comes with all the usual quality and ease-of-use design features that make up the best Corsair PSUs: a great build design, 80+ Gold efficiency and a fully modular unit. The one drawback of this PSU is the cost: for the same money or less, you might as well upgrade to a higher-wattage PSU. You cannot beat Corsair for quality, however, and the RM750x matches the 3090 power supply requirements effortlessly!

Best Efficient PSU for RTX 3090: Seasonic Prime TX-850

Seasonic Prime TX-850

Wattage

850 W

80 Plus certification

Titanium

Modularity

Fully modular

Pros
  • Titanium efficiency
  • Hybrid fan
  • 12-year warranty
Cons
  • Premium price

For an energy-conscious PC build, the Seasonic Prime TX-850 is a stellar 850W PSU for 3090 GPUs that maximizes your computer’s electrical efficiency. With an 80+ Titanium rating, the only way this unit could be more efficient is if it came with a wind turbine. It does still come with a smaller fan, though you may not even need that: hybrid cooling technology allows you to choose quieter fan-less cooling modes, enabling the TX-850 to run smoothly and silently. Fully modular to allow for easy installation and customization with cable mods, this PSU is the absolute premium when it comes to efficient PSUs for the RTX 3090. That said, you’ll be paying a premium price for it, but the TX-850 remains unbeaten for energy efficiency – and is an ideal 3090 PSU!

FAQs

Is ATX 3.0 necessary?

If you want to future-proof your PSU, then choosing a unit with ATX 3.0 compatibility is a wise choice. ATX 3.0 is the latest in high-efficiency cabling technology, meaning that your PC can draw on more power, more efficiently. As PCs become more demanding, it’s worth having a to-date PSU to handle the power supply requirements of upcoming GPUs.

How many watts does a PSU for RTX 3090 draw?

NVIDIA states that you should dedicate 350W of power for the GPU, with the minimum 3090 recommended PSU being 750W. It is always wiser to have some energy headroom, however, so we recommend at least an 850W PSU for 3090 PC builds.

In Summary

That concludes our guide on the best PSU for 3090 PC builds! Regardless of your priorities when building a custom computer, the power supply is an essential component. Any of our top choices today will make phenomenal 3090-recommended PSUs, so we hope you found the perfect part for your PC!

If not, we have plenty of buyer’s guides for all sorts of PSUs parts across the board: for a literal small-scale build, check out our guide on the best SFX PSUs!

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