Best PSU for RTX 4090: Our Top 4 Picks

In one of our previous guides, we covered the best PC cases for RTX 4090, and now, expanding on the same, we will be looking at the best PSU for RTX 4090. 

The RTX 4090 is a gold-standard GPU for gamers, and to get the most out of it, you need to provide it with the best functioning environment. This means you need to provide it with the right amount of power and a good PSU. 

Choosing the wrong PSU can lead to instability, throttling, or, worse, fried components. The good thing is that you have landed on the right page. 

Today, we are going to list the best PSU for RTX 4090. You can select the best one based on your PC case and other configurations. Now, let’s dive right in!

Why a Good PSU?

Whenever we build a custom gaming PC, we often overlook the PSU. However, this is one of the most important components of any build. If we talk about RTX 4090 in particular, it comes with a TDP (Thermal Design Power) rating of 450W. 

This, however, represents the theoretical maximum power the card draws under load.  In reality, with transient power spikes, the actual power draw can be considerably higher.

Hence, a minimum wattage of 850W is strongly recommended.  This provides the headroom to handle peak loads without your PSU straining, ensuring stability and extending lifespan.

What is the 80+ Platinum Rating?

Now, let’s delve into the world of efficiency.  Right off the bat, it is important to understand that no PSU is 100% efficient.  A portion of the power it pulls from the wall is lost as heat. So, how can you be assured of your PSU’s efficiency?

Well, we have something called the 80 Plus rating. The 80+ certification program provides a standardized way to measure PSU efficiency. The higher the certification (Bronze, Silver, Gold, Platinum, Titanium), the less power is wasted as heat, and the more is delivered to your components.  

For the power-hungry RTX 4090, aiming for a PSU with at least an 80+ Platinum certification is crucial. This translates to lower energy bills, less heat generation within your case, and a quieter overall system.

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4 Best PSU for RTX 4090

ASUS ROG Thor 850W

First, we have the ASUS ROG Thor 850W Platinum, a great PSU for people who want the best combination of top-notch performance and efficiency for their RTX 4090 builds.

This 850W powerhouse boasts 80+ Platinum efficiency and a feature set designed to impress: Aura Sync RGB lighting and an integrated OLED information panel. While it delivers the muscle needed for the RTX 4090, the focus on aesthetics and monitoring comes at a premium price point.

The ROG Thor 850W Platinum packs a punch with 850W of power delivery. This ensures the RTX 4090 has ample headroom to breathe, even with overclocking or the addition of moderate future upgrades.

The 80+ Platinum certification guarantees good efficiency, translating to lower energy bills and a cooler-running system, which is especially important for users pushing the limits of their high-performance builds.

While the focus on aesthetics might be a major selling point for some users, it’s important to consider your priorities. If a clean and well-organized build with a touch of customizable RGB lighting is important, the ROG Thor 850W Platinum delivers.

But for those who prioritize silence over aesthetics, there might be better options with a stronger focus on quiet operation under heavy loads.

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be quiet! Dark Power Pro 13

Read: be quiet! Dark Power Pro 13 1300W: A Leviathan of Power and Silence [Review]

Next up, we have the be quiet! Dark Power Pro 13 1300W and this PSU is for users who want to go all out. It features a stunning 1300W of power output, making it ideal for users with the most power-hungry graphics cards, such as the Nvidia RTX 4090, and future high-end hardware.

This provides adequate room for overclocking and future upgrades. Despite its power, it has 80+ Titanium certification, which indicates great efficiency for lower energy bills and a cooler-running system. 

While the core focus is on performance, be quiet! offers a variant with integrated addressable RGB (ARGB) lighting. This allows you to customize the lighting effects to match your overall build theme, adding a touch of visual flair to this otherwise utilitarian component.

With this PSU, you get quality all around. It comes with high-quality Japanese capacitors and active components. This ultimately means reliable performance and long-lasting durability, ensuring your PSU can handle your system’s demands for years.

Since it is loaded with the best features, the PSU comes at a premium price. Additionally, its massive 1300W capacity might be overkill for users who don’t have an immediate need for such extreme power. 

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Corsair RM1000x SHIFT

The Corsair RM1000x SHIFT is a top contender for the best PSU for RTX 4090, and that is for all the good reasons.

This 80+ Gold-certified PSU comes with 1000W of power delivery, which is more than good for RTX 4090. There is also ample headroom to handle the RTX 4090’s power demands, even with transient power spikes. 

The fully modular design with innovative side-mounted connectors allows for a clean and organized build, while the high-quality fan and cooling system ensures near-silent operation.

The RM1000x SHIFT’s 1000W power delivery provides a comfortable buffer for the RTX 4090. This ensures stable operation even during intense gaming sessions or overclocking.

The 80+ Gold certification translates to lower energy bills and cooler system operation, making it an efficient choice for powering a high-performance system.

However, users should consider a few things. While the side-mounted connectors offer a clean aesthetic advantage, they might require some cable management adjustments in tight cases. The price point is also higher than competitors offering similar features.

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Cooler Master XG850

The Cooler Master XG850 Plus Platinum is ideal for PC enthusiasts looking for a reliable and efficient PSU for their high-end builds.

This 850W powerhouse boasts 80+ Platinum certification, signifying excellent efficiency for lower energy bills and a cooler system operation. But the XG850 Plus Platinum goes beyond just the basics.

It offers a fully modular design, high-quality Japanese capacitors, an optional built-in Information Display Panel, and a silent or ARGB cooling fan. 

The 850-watt power delivery capacity is ideal for RTX 4090, with good headroom for people who want to overclock their CPUs.

The PSU’s modular design eliminates cable clutter for a clean aesthetic and improved airflow. While not available on all XG850 Plus Platinum models, the optional Information Display Panel adds a unique touch.

This small display allows you to monitor real-time system vitals like the voltage, power draw, and fan speed. Additionally, ARGB models allow for managing the ARGB lighting effects, giving you more control over the overall look of your build.

However, it is important to understand that you can get a wider range of wattage than some other competitors. 

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Final Thoughts

Those are some of the best PSUs for RTX 4090. You must consider other factors like the size of your PC case, aesthetics, budget, and other components before you make any final decision. This list should help you select your build’s best PSU for RTX 4090. 

If you have any queries, feel free to reach out to us. We hope this guide helps you in building the best gaming PC.

Further Reading:

• Best PC Cases for RTX 4090: Our Top 4 Picks
• 5 Best 140mm PC Case Fans (RGB & Non-RGB)
• RTX 4090 vs. RTX 3080 Ti: Worth Upgrading?
• Intel Core i9-14900K vs. Ryzen 9 7900X3D: Which is Better?