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The best PC power supply for 2021

Your PC’s power supply is an important component in terms of safety and performance. The right PC power supply should be reliable, have a long lifespan, and protect your machine from issues like overclocking and surges. It’s not one of the first things you think about when putting together a custom build, but it’s an important element nonetheless.

If you need a new PC power supply, our top picks will give you a better idea of which components are a good match for your needs. You might not be familiar with the specs you should look for, but our guide to the best PC power supplies for 2020 is a good place to start your research!

Not sure what you need? Check out our guide on how to measure your PC’s power draw.

The best PC power supplly at a glance:

The best PC power supply: Corsair RM750

Corsair RM750 PSU

Corsair makes some fantastic power supplies. But many come with very similar naming conventions, so picking our favorite of even that lineup — let alone all PSUs — wasn’t easy. But the RM750 gets the nod for its combination of high-end features and affordable pricing. At not far north of $100, the 750w model isn’t super cheap, but it’s far from expensive. It comes in a number of wattages, so you can save a little if 750w is overkill for you or opt for 850w for just $10 more.

Whichever option you pick, the Corsair RM750 range comes with fully modular cabling, high-quality capacitors, a quiet fan, and modern standby support, which helps this unit get up to speed from standby in under five seconds. The more-expensive RMX range offers slightly higher-quality components, but it’s not quite as efficient. This unit enjoys an 80+ Gold efficiency rating, so you can be sure that you aren’t wasting much power even when your system is running at full tilt.

The best budget PC power supply: Corsair CX550

Corsair CX550 PSU

The PSU we recommend in all of our budget gaming system builds is the Corsair CX550. It isn’t a trendsetter or showstopper, but it is a stable and safe power supply. At this kind of price, that’s exactly what you need. It’s available in various other capacities and for just $5 more you can get semi-modular cabling, but this entry-level version is the most affordable and therefore most suited to our favorite budget PSU.

Despite the relatively low cost, you still get a quiet fan, a five-year warranty, and 80+ Bronze certification for reasonable efficiency. Compatible with all modern CPUs and motherboards, the Corsair CX550 has enough juice to power entry-level gaming PCs, all the way up to relatively high-end systems with powerful graphics cards. Double-check it has enough headroom for your particular GPU on a site like RealHardTech first, but if this falls within your limits, then the CX550 is a fantastic budget power supply to choose.

The best small form PC power supply: FSP Dagger 550w

FSP Dagger 550w

Packing high-powered components into a miniature PC case is all the rage. But along with using compact cooling solutions and motherboards, many MicroATX and mini-ITX cases also need to use a small form PSU. This SFX unit from FSP is a fantastic option with an attractive shell, excellent modular cabling, and a decent capacity of 500w. If you need more, though, there’s always the 650w version for about $20 more.

The FSP Dagger 550w enjoys 80+ gold efficiency, a quiet fan that operates at near silent when the unit is under 50% load and has full Japanese capacitors for excellent stability and long life. If you run into any problems (which you shouldn’t), there is a three-year warranty you can take advantage of, too.

The best high-end PC power supply: Seasonic Prime Ultra 1300w

Seasonic Prime 1300w PSU

There’s not much point in building a multi-GPU system these days outside of benchmarking and a very few select games. But if you do, you’ll want a monstrous power supply to make sure your 2-4 powerful graphics cards have all the power they need. The Seasonic Prime Ultra is our favorite for that task, with a mammoth 1,300 watts of power and all the features you’d expect from a high-end PSU.

It’s fully modular, enjoys an 80+ Platinum efficiency rating, has a 12-year warranty, and operates entirely silently until 40 percent load is reached. It also has gold plated connectors for additional durability and a touch of class, all while supporting multiple graphics cards.

The Thermaltake Toughpower Grand RGB 650w is pricey, but for super-powered PCs that want the utmost stability and plenty of protection for your highly expensive components, you can’t go wrong with the Seasonic Prime Ultra.

The best RGB PC power supply: Thermaltake Toughpower Grand RGB 650w

Thermaltake Toughpower RGB

If you want your PC to display vibrant and well-lit imagery, you will have to pay extra attention to your PSU when choosing RGB-equipped components. Do not be fooled by a pleasing appearance because the exterior design doesn’t always mean adequate power. Your power supply needs to have the proper components to ensure the best functionality. That’s where the Thermaltake Toughpower Grand RGB comes in.

Modular cabling and programmable RGB lighting come with this model, plus an efficiency rating of 80+ Gold. Its operating fan is virtually silent, although it will kick up a notch if necessary. The RGB lighting can sync with your PC’s other lighting to eliminate annoying differences and achieve a coherent effect.

Thermaltake Toughpower Grand RGB 650w includes a decade-long warranty, making it simple to get a replacement if your lighting tanks.

A PC power supply might not seem essential, but it’s worth considering. These tools boost your computer’s lifespan and overall functionality – and anyway, your PC needs to get its power from somewhere. 

There are also plenty of customization options, so you can give your power supply a look you love. We recommend any of the options in this guide.

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