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Best PSU for the Ryzen 9 7900X3D

Best Power supply for the Ryzen 9 7900X3D

Updated: Jun 30, 2023 11:54 am
Best PSU for the Ryzen 9 7900X3D

The Ryzen 9 7900X3D is the AMD V-cache enhanced edition of the standard 7900X. It’s set to be released in February 2023. And based on what we’ve seen so far, the processor looks to be a top option for both gamers and content creators. But what is the best PSU for the Ryzen 9 7900X3D?

Now Read: Best CPU Cooler for Ryzen 9 7900X3D.

Here we will share the top picks for the Ryzen 9 7900X3D.

The Ryzen 9 7900X3D – power requirements

The Ryzen 9 7900X3D provides us with some impressive performance. With 128MBs of shared L3 cache available to the processor’s cores, we expect the new Ryzen to give tough competition to the high-end i7 and i9 Raptor Lake CPUs from Intel.

Something that really stands out about the new 7900X3D is its 120-watt TDP. That’s pretty power efficient for a processor of its caliber!

For reference, the standard 7900X consumes a much higher 170 watts of power, whereas the i7-13700K can soak up 254 watts of power consumption. 

With that in mind, you really have to wonder how AMD has managed to save so much energy while offering performance that is in the same ballpark as the above processors. 

The 7900X3D’s moderate 120-watt power consumption means you can get away with using a PSU with a slightly lower wattage rating. Not by much, though, since the required PSU wattage for the average system is far more dependent on the GPU’s power consumption, not the CPU’s

Considering that the 7900X3D is a high-end CPU (it’s going to be the second-best in AMD’s lineup), you will probably be pairing it with something like a 4090 or a 7900xtx.

At least, you will have the ability to do so, since the new Ryzen’s 12 high-performance cores will be more than enough to keep up with the demands of the above GPUs.

Therefore, your overall system wattage will still end up being relatively high. Taking that into account, let’s see what PSU works best for a Ryzen 9 7900X3D system. 

Things to consider when choosing the best power supply for Ryzen 9 7900X3D

Let’s discuss what makes a PSU suitable for any particular system and why we recommend the Corsair RM850x in this case. 


As you’re probably already aware, this is the primary factor that needs consideration when you’re selecting between power supply units. 

A PSU’s wattage rating is how much power it can supply to your system under the maximum workload. You want your PSU’s max wattage rating to exceed the theoretical maximum power consumption of your PC by a margin of 20 to 30%. 

There are three reasons for this. 

  • Component power draw, typically represented by TDP for CPUs and GPUs, isn’t entirely accurate. It’s a better representation of the ‘average’ power draw under maximum load, which is to say that these components can consume more power than their TDP in short bursts. 
  • PSUs tend to provide the most efficiency when they’re serving 60-70% of their max rating. The efficiency curve for each PSU is different, though, so this is a very general statement. 
  • Having 20 to 30% headroom for your PSU makes sure it doesn’t get too hot. Power supplies have a max operational temperature, and getting too hot can cause them to either shut down or gradually incur damage, shortening their lifespan. 


Efficiency can be thought of as a way to measure how much power is wasted by your PSU from the time its pulled out from the wall socket to the time it’s delivered to your PC components. 

There are several efficiency ratings to be aware of. The bare minimum you want in 2023 is 80+ Bronze.  


Modern-day PSUs are mostly modular. They allow you to disconnect power cables from the supply and only use the ones that are needed. 

This is certainly convenient since it affords you better cable management and less internal clutter. 

The Corsair RM850x

Editor’s Choice

Corsair RM850x

Corsair RM850x



80 Plus certification



Fully Modular

Based on the factors above, we believe the best power supply for the Ryzen 9 7900X3D is the Corsair RM850x.

Corsair’s RM850x has been around for a while, but with the ability to supply your system with 850 watts of clean, consistent power, it can certainly get the job done very well, even today. 

850 watts of power delivery is plenty for a Ryzen 9 7900X3D PC, even if you run it with a 4090 Graphics card, which has a TDP of 450 watts of its own. 

The RM850x is very reliable, coming out of the box with a 10-year warranty. Built with high-quality materials, it won’t give out on you anytime soon. If it does, though, you’ll have a decade-long warranty as a backup. 

Additionally, the RM850x is 80+ gold rated. Not the best efficiency rating, but very robust overall. 

The maglev fan is a nice-to-have and is complemented by a hybrid mode that causes the fan to stay off until it’s needed, minimizing noise. 

Final thoughts

Overall, the RM850x is a solid PSU and the best option for a Ryzen 9 7900X3D build. 

It supplies plenty of wattage for the healthy running of the CPU, is modular and 80+ gold efficient, has great build quality, and is backed by a 10-year warranty – all very valuable features to have in a PSU. 

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