Best 1000W PSU 2023 – our top high wattage power supplies

With more power hungry components, you'll need a PSU to match

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With component power ratings on the rise at the high-end, you need a power supply to match, as such the best 1000W PSU is the one to look for, an ideal solution for gaming PCs with flagship components like the RTX 4090. As a power supply is the life force of your system, it needs to be reliable, high quality and the best PSU for the job. Don’t know what to look? Worry not, as we keep this page updated with the the very best on show. We can throw out a couple of quick-fire suggestions like the Corsair RM1000x and ASUS ROG Thor, though there’s even more to talk about.

When choosing the right model, everything from your budget to efficiency requirements needs to be considered. A high-end gaming PC featuring an RTX 4090 would benefit from a high-wattage PSU even though it is technically more than required. This is because many system builders seek a bit of headroom and longevity from their investment. Every selection in this round up features a high trust rating, excellent build quality, and impressive warranty.

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Best 1000W PSU in 2024

Moving on to our list of the best 1000W power supplies, in greater detail. We discuss the specs, pros, and cons of each of our selected PSUs. So, if you want to do a little more research into what you’re buying, then our expert team can help you out. Let’s just straight into our top pick and work from there.

Corsair RM1000x

Corsair RM1000x

Wattage

1000W

Certification

Gold

Modularity

Fully

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Pros

• MagLev (Magnetic Levitation) fan runs quietly
• Gold 80 Plus rating provides good efficiency
• Backed-up by 10 year warranty

Cons

• No ATX 3.0 support – go for RMx Shift model instead

For an all-around best 1000W PSU, the Corsair RM1000X is the option to go for. It is rated with a Gold 80 Plus rating which is a standard rating for power conversion in most power supplies. But that does balance out the cost of a higher wattage unit might need. Corsair components can be trusted in terms of build quality, and the 10-year warranty is a testament to that. It runs quietly too during low-mid workloads thanks to the low-noise MagLev design and Zero RPM mode with customized fan curve.

It is a fully modular design so you can choose which cables you need to actually put into your build. Since you might not need to have all of those extra SATA cables for your one singular SSD. Or then you might need to use up three PCIe of the six. In total, you will find two EPS, 11 SATA, two floppy, eight PCIe, and one motherboard connector in the supply of the PSU. That gives you plenty of opportunity to fit in anything you might need in your gaming PC.

ASUS ROG Thor 1000W Platinum II

ASUS ROG Thor 1000W Platinum II

Wattage

1000W

Efficiency

80 PLUS Platinum

Modularity

Fully-modular

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Pros

• Striking design with OLED panel
• Exceptional 80+ Platinum efficiency rating
• Custom ASUS ROG heatsink for better cooling
• 0dB fan mode switch on-board

Cons

• Expensive
• No native ATX 3.0, comes with adapter

Have some extra cash to throw around and want something a little more striking? Well, the aptly-named ASUS ROG Thor is a powerful 1000W power supply with an impressive 80 PLUS Platinum efficiency rating, which places it above the Corsair’s Gold. While this PSU isn’t natively compliant with ATX 3.0, it does come with a PCIe Gen 5.0-ready adapter cable to help you harness the power for the high-end 40-series GPUs like the RTX 4090. Not quite the same as proper support, but it’s something.

It also comes with a platinum rating so it’s a highly efficient build, but that does come with the additional cost. As a ROG component, it comes with Aura Sync RGB lights built-in to help you sync the lighting to your other ROG components and peripherals to fully fit in with the rest of your build. It’s Axial tech 135mm fan keeps things quiet and cool as well. All of these impressive specs and features are backed-up with a 10-year warranty for convenience and peace of mind.

If you’re instead building for an micro ATX or mini ATX case, then ASUS ROG Loki SFX-L is a compact alternative. Their Loki PSU also offers ATX 3.0 and PCIe 5.0 support.

Seasonic Prime ATX 3.0 TX-1300

Seasonic Prime ATX 3.0 TX-1300

Wattage

1300W

Certication

80+ Titanium

Modularity

Fully

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Pros

• Incredible efficiency in conversion
• ATX 3.0 standard for the latest graphics cards
• 12 Years warranty for peace of mind
• Features plenty of connectors and power for any setup

Cons

• Ludicrously expensive

Want even more power and efficiency? If you’re more concerned about the power ratings, then you should consider the most efficient power supply. That comes in of the form of the Seasonic Prime ATX 3.0 TX-1300, with a Titanium 80 Plus and Cybenetics rating, it does reach the top spec of efficiency above 90% across the board. Of course, we’re throwing in an extra 300W here to bring the total up to 1300W – just for anyone that needs even more power to work with.

The fully modular power supply comes with plenty of connectors to take advantage of. It has one motherboard, three CPU, six PCIe, 16 SATA, one SATA 3.3V, three Molex, and two 12VHPWR connectors for you to power all of your components. It also comes with a Lamda A certification from Cybenetics giving you peace of mind that it is a quiet PSU as well that will keep things running. It also comes with a long 12-year warranty it comes with so it should last you some time.

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Is a 1000W PSU for you? Things to consider

1000W is a very high wattage to go for, but it gives plenty of headroom for quieter operation or longevity. If you have a powerful GPU or CPU it might already be a requirement, however, if not gives you something to upgrade into in years to come.

As these PSUs are meant to last a long time, they are a good future-proof option, as who knows how powerful the next generation of graphics cards will get.

Connectors

Planning to or using one of Nvidia’s new GPUs, you might have to use the 16-pin connector it has on it. You could use an adapter that comes with it, but some power supplies support it natively and prevent the need for an Octopus connector.

You may also have a varying number of SATA devices and peripherals that need power in your system. With a 1000W PSU, you can expect most of the options to feature all of the necessary cables and plenty of options for connecting them up.

Modularity

When cable management is a consideration for your build, going for a fully modular power supply is the best option for it. Although the PSUs at this wattage are top-tier and so are unlikely to be anything but modular. This means you can limit the number of connectors you actually use and reduce the cable clutter in the back of your case, altogether making cable management easier and much nicer to look at.

Power efficiency

At a 1000W there is a lot of power that needs converting from your AC wall supply to the DC power your PC needs. That conversion is inefficient and produces heat which is wasteful, so these ratings give you an idea of how effective it is. If it’s 80 Plus or the more recent Cybenetics certification they range from bronze to platinum at how effective the conversion is and how much money you can save on electricity costs.

Best 1000W PSU FAQs

Is it worth getting a 1000W PSU?

1000W PSUs are definitely high-end options which will set you back a decent amount of cash. That being said, if you want to support some seriously powerful components, then you’ll need a power supply suitable for the job.

Picking up a 1000W PSU is worth it if you are aiming for a high-end build which is future-proof. If you’re going for a more mid-range build, then it’s definitely overkill.

Is 1000W PSU enough for RTX 4090?

Nvidia recommends at least a 850W power supply for the RTX 4090 Founder’s Edition, which means that a 1000W power supply is more than enough for this card and a great future-proof option. We also suggest getting an ATX 3.0 capable PSU to fully support it.

Some custom 4090 models with overclocks will exceed the recommended 850W level, so 1000W provides a good safety net overall for your high-end PC build.

Final word

Sadly we’ve come to the end of our guide to the best 1000W power supplies. Like we said earlier though, we’re always looking to update our guides so they reflect the best money can buy. We’ll be back to revise our top picks when we can – including any hardware we have the pleasure of reviewing personally.

1000W PSUs are fantastic if you want a truly high-end build fitted with the latest and greatest hardware, suitable for those power-hungry components. If you’re going for the top-end 40-series GeForce graphics cards though, just remember that ATX 3.0 support is what’s best.