Best PSU for RTX 4090, what power supply do you need?

The RTX 4090 is a powerful graphics card, making many question if they need an upgrade in the power department

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If you just got your hands on this beast of a GPU and you want to upgrade your PSU to match the performance of the GeForce RTX 4090, you are at the right place.

This GPU needs a little more power than its predecessor, NVIDIA recommends you have a PSU that’s at least 850W.

You can have a more powerful PSU to give yourself a bit of headroom and longevity, that’s always great, especially if you are planning on upgrading your gear in the future. We are going to explore some more expensive options as well as one budget-friendly option.

Keep in mind that the budget-friendly option in many cases is as good as the best-selling ones. You only need a PSU that can support the power requirement of every component inside of your PC, all the extra features just make your experience better.

Best PSU for RTX 4090

In this section of our article, we are going to show you some high-end and best-selling PSUs on the market. These are on the more expensive side, but in our next section, we are going to show some more budget-friendly supply units as well.

ASUS ROG Thor 1000W Platinum II

ASUS ROG Thor 1000W Platinum II

Wattage
1000W
Efficiency
80 PLUS Platinum
Modularity
Fully-modular
ATX 3.0
Yes

The ASUS Rog Thor 1000W Power Supply with LiveDash OLED Panel is overkill from a wattage perspective as it will give you serious headroom. It’s probably one of the best PSUs on the market and naturally features full modularity and RGB.

The 1000W model has an 80 PLUS Platinum rating. It has a built-in 0dB cooling feature with dustproof ipx5 fans with RGB heatsinks for improved cooling. The OLED power display means you can monitor your power usage in real-time and you can take advantage of this PSU being ATX 3.0.

Best Budget PSU for RTX 4090

Corsair RM850x

Wattage
850W
80 Plus certification
Gold
Modularity
Fully Modular

If you need a budget-friendly option, we recommend Corsair’s highly-reliable RM850X model. This is fully modular, gold-rated, and the recommended amount of wattage, perfect.

How much power does the RTX 4090 need?

This is the flagship from Nvidia, it is one powerful piece of kit.

Because of that, the 4090 comes with a high TDP and this can mean those that were already pushing their old hardware to the limits may need an upgrade.

Others may be building a PC for the first time, bravo, you’ve gone for the don of GPUs.

The RTX 4090 sits with a 450W TDP, 100 more than its predecessor. This is high and while Nvidia recommends a minimum of 850W PSUs, we think you should aim higher to prolong your investment.

Some power recommendations can change depending on the AIB model your GPU is, so always double-check with the relevant manufacturer’s web page so you never end up disappointed.

Conclusion – do you need to upgrade for the 4090?

In conclusion, when it comes to supplying your powerful RTX 4090 GPU, a PSU with at least 850W is recommended.

The options above are all of the highest quality and are regularly used in our in-house builds.

It’s important to ensure that the PSU you select is compatible with the rest of your system and can support the power requirements of all of your components.

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