The Ryzen 9000 series processors were expected to be released on July 31st, but AMD decided to delay the launch; however, the accompanying AM4 processors didn’t have the same fate, and you can now purchase the Ryzen 9 5900XT and the 5800XT. There was some uncertainty whether these processors would also be delayed but AMD stuck to their original launch date, meaning we can get started on our 5900XT builds.
To determine which PSU would best suit your 5900XT build, we searched the market, filtered the options, thoroughly tested them in-house, and put together this guide featuring those units that made the cut.
You’ll find their reviews, details, features, pros and cons—everything you’ll need to make an informed decision. If you’re interested in getting your hands on this CPU as soon as it hits the shelves, check out our Where to Buy 5900XT page, which lists multiple retailers in one place to save you time and effort.
- Best PSU for Ryzen 9 5900XT overall
Corsair RM750x
- Wattage: 750W
- Form Factor: ATX
- Rating: 80 PLUS Gold, Cybenetics Gold
- Design: Fully Modular
- Best high-end PSU for Ryzen 9 5900XT
Corsair RM850x Shift White
- Wattage: 850W
- Form Factor: ATX (160mm L)
- Rating: 80+ Gold, Cybenetics Gold
- Design: Fully modular, side connectors
- Best budget PSU for Ryzen 9 5900XT
Corsair CX750
- Wattage: 750W
- Form Factor: ATX
- Rating: 80 Plus Bronze, Cybenetics Silver
- Design: Non-modular
How we picked
It comes as no surprise that PSUs don’t get the limelight that CPUs or GPUs get because they lack the bells and whistles or simply the “wow” factor. That said, a PSU is the most important component in any build as it is responsible for ensuring that every component gets the necessary power and saves them in case of a surge.
So, considering its purpose, we take into account the efficiency, fan size, capacitors, form factor, and modularity of each PSU, test them in-house, and present you with a list of contenders that were able to tough it out. If you’re interested in learning how we test our CPUs, GPUs, routers, and printers, check out our PC Guide Testing Lab, where we explain the process in detail. Besides that, we’ve also explained how we test and review products to provide the utmost clarity to our readers.
Our top picks
- Wattage: 750W
- Form Factor: ATX
- Rating: 80 PLUS Gold, Cybenetics Gold
- Design: Fully Modular
- It has an MTBF of 100,000 hours
- It comes with a 10-year warranty
- It has a 135mm maglev fan
- It doesn’t support ATX 3
The Ryzen 9 5900XT has a TDP of 105W, but it also comes unlocked for overclocking, meaning its TDP can increase. So, to cover all bases, we recommend using the Corsair RM750x, as it is the only PSU that got a 5/5 rating in its review.
For starters, this PSU is fully modular and has an ATX form factor. What this means is that cable management with this unit should be as easy as pie as you connect the cable you want to use and keep the rest of them in the box. It also has 150 x 86 x 160mm dimensions, meaning it should fit inside any standard casing easily. In case you’re wondering how many different types of cases there are, we’ve got you covered with our PC case size guide, which explains everything in detail.
The RM750x doesn’t have ATX 3 support, but you can easily order a 12-pin connector on the side to power modern, demanding GPUs like the RTX 4080 Super and the RX 7900 XT, both of which we’ve reviewed.
Along with a high-quality build and components, it is a lasting solution for many builds to come. With the 750W likely to be plenty for years it just lacks the ATX 3 standard and native cable, which you have to instead order separately.
PC Guide
This PSU comes with 135mm maglev fans. These fans rotate using magnets instead of conventional gears, which wear down over time. This also ensures the fan is quiet during operation.
It comes with a gold rating from 80 Plus and Cybernetics. During our testing, it reached the desired level of 706W. On top of that, its efficiency performance was also great, as it had 88% and 90.2% efficiency at 115V and 230V. The noise levels also ranged from 27.98 to 28 dB.
Overall, the RM750x is an excellent, well-rounded PSU that efficiently completes the job. It also costs less than premium power supply units, which makes it even better.
What users say
According to Amazon reviews, this PSU has great value, quality, and performance. One reviewer said: “Corsair is a reputable brand known for its high-quality PC components, and the RMX Series continues that tradition. The RM750x is a testament to Corsair’s commitment to providing top-tier power supplies for enthusiasts and professionals.”
- Wattage: 850W
- Form Factor: ATX (160mm L)
- Rating: 80+ Gold, Cybenetics Gold
- Design: Fully modular, side connectors
- It features the ATX 3.1 standard
- The innovative side connector design makes it easy to connect cables
- It has excellent built quality and internal components
- The accompanying type 5 cables can be challenging to handle
- The Shift and white variants cost more
If you’ve got a free hand to spend on a new PSU, we recommend going for the Corsair RM850x Shift. It covers multiple boxes, such as ATX 3 support, and in our RM850x Shift review, it performed stellarly.
This is an ATX power supply unit with a 160 mm length, which is slightly longer than standard ATX units. However, its innovative design puts the connectors on the side, which are usually found at the back of the unit. This should help make connections even easier, and its fully modular nature should ensure smooth cable management.
Since it supports ATX 3, it comes with the 12VHPWR connector, meaning you can directly use it to power your Nvidia graphics cards without using an adapter. One thing to keep in mind is that due to the ports being moved to the side, the orientation and cable connections are different from traditional PSUs.
Bringing native ATX 3 support for Nvidia graphics cards but updating them for safer 12V-2×6 puts you a bit more at peace of mind.
PC Guide
To check its performance, we took it to our test bench, which had a Ryzen 9 7950X and an RTX 3090 waiting for it with a combined power draw of 520W. At idle, the power draw hovered around 126W, but with the system in full swing, it reached 705W, with the CPU and CPU taking around 570W.
The RM850x breezed through this with ease, making it an excellent option for the Ryzen 9 5900XT. You could pair any high-end card with it without worrying about whether it’ll be able to handle it. You should also be able to overclock your GPU, and if you’re wondering how to do that, we’ve covered you with our step-by-step how-to guide with pictures.
Cybenetics tested the RM850x Shift version, which should provide good insight into its efficiency. At 115V, it had an efficiency of 88.672% with a noise output of 22.94 dB(A), and at 230V, it increased to 90.817%, with the noise levels slightly ramping up to 23.03 dB(A). So, with these results, its efficiency and noise ratings check out, making it one of the best power supplies available.
Overall, the RM850x costs more compared to other options, but its features and performance more than justify the price. If you want a PSU that would power your rig through multiple upgrades, this is the option.
- Wattage: 750W
- Form Factor: ATX
- Rating: 80 Plus Bronze, Cybenetics Silver
- Design: Non-modular
- It comes in a very affordable price range
- The rifle-bearing fan has a long lifespan and helps lower the noise output
- It is non-modular, which hinders any customization
- It can get noisy under heavy load
For those looking to complete their budget build and want a PSU that gets the job done, we recommend the Corsair CX 750. During our testing for its review, we found that it had a decent performance, but given its budget nature, we can’t complain.
To begin with, this is a non-modular PSU, meaning all the cables are attached to it and can’t be removed. Once you’re done making the relevant connections, the cable not in use will have to be stored in the PSU compartment, which isn’t ideal, but a fully modular budget option isn’t available.
It has a 750W rating, which means you can run high-end GPU and CPU combinations with it even though it isn’t a PCIe 5 PSU or hahasha2VHPWR connector.
If you’re after a more budget PSU, the Corsair CX750 provides a good choice, dropping down from its initial cost makes it a lot more competitive choice.
PC Guide
The CX 750 measures 150mm x 86mm x 140mm, which means it should fit inside any standard PC case without any issues, but it isn’t small enough to fit inside ITX PC cases. It also has a 140mm rifle-bearing fan, which is designed to pump a reservoir of fluid, allowing it to be mounted horizontally without decreasing its lifespan. The lubricant also reduces the noise output.
We used the same test bench as the RM850X, which has a 7950X and 3090. Under full load, this power supply was drawing 736W, which only leaves a 14W overhead, but since it didn’t go over that, the test was a success.
Overall, the CX 750 has an 80 Plus Bronze and Cybenetics Silver rating, which isn’t the best, but it lowers its price, making it a decent budget pick. As we tested, it can support a high-end system, and that is what matters.
What user say
According to Amazon reviews, this PSU does what it advertises and doesn’t leave anything on the table. One reviewer said: “Worked out of the box. this is a no frills PSU, but it gets it done. I trust corsairs products.”
How to pick the best PSU for this CPU
Before you settle on any one power supply, there are a couple of factors that you need to consider. Keeping those in mind should help you narrow down your list of options and select a PSU with a good performance-to-value ratio that is the perfect fit for you. We’ve listed some of the factors below.
Efficiency
There are two standards for power supply units: 80 PLUS and Cybenetics.
- 80 Plus
- 80 Plus Bronze
- 80 Plus Silver
- 80 Plus Gold
- 80 Plus Platinum
- 80 Plus Titanium
Cybenetics also has six different standards that vary just a bit from 80 PLUS.
- Cybenetics Bronze
- Cybenetics Silver
- Cybenetics Gold
- Cybenetics Platinum
- Cybenetics Titanium
- Cybenetics Diamond
The higher a PSU is rated, the more efficient it is. This means minimal energy is wasted in travel and heat, and the maximum power being pulled is utilized. That said, PSUs with higher efficiency ratings cost more but save more on electricity bills in the long run.
Form factor
The most common form factor for power supply units is ATX. This means they have dimensions that allow them to be installed easily in the best full-tower and mid-tower PC cases. SFX power supplies have a small form factor, allowing them to be installed in the best micro ATX cases as they have less space inside. If you’re interested in exploring some options, we recommend checking out our best SFX power supply guide for the top picks.
Modularity
Power supply units are of three types: fully modular, semi-modular, and non-modular. Fully modular PSUs are customizable in that you can choose which cables to connect and leave the rest aside, making cable management a breeze.
Semi-modular PSUs have some cables attached to them, while others can be removed. Lastly, non-modular PSUs have all the wires attached, and they can’t be removed. So, cable management is more challenging, and you have to shove the unused cables in the PSU compartment, cluttering it.
That said, fully modular PSUs cost more due to their internal components and design, while non-modular PSUs are more pocket-friendly. So, depending on your budget, go for the PSU that offers good efficiency and performance, regardless of the type.
