Best PC power supply 2018: top PSUs for your PC

Best power supply

If you’re building the best PC, the most important thing you can et is one of the best PC power supplies. We know, it’s blunt, but every component in your rig is going to rely on the best PC power supply for life, so it’s critically important that you don’t compromise – even if it means you have less money for the best graphics card.  

There’s no easy way to put it: having a PC power supply die on you might be one of the worst things you’ll ever have to go through with your PC. This is because many symptoms of a dying PSU will simply go by unnoticed until it’s too late. Sure, some are as obvious as having your PC just refuse to start, but they can also be as subtle as some lost power efficiency. By the time you notice your PSU is failing, it could be too late. So, do yourself a favor and buy the best PC power supply you can muster today, so it doesn’t die tomorrow.

It’s not all negative though, as there’s a wide variety of fantastic PC power supplies available right now. And, even if you’re trying to watch your budget, you can still get one of the best PC power supplies. There are even some amazing high-power units, rocking RGB lighting, that can power the best gaming PCs – if you have the cash ready. Regardless of what you’re looking for, you can be sure that you’ll find the best PC power supplies right here on this list.   

Best power supply: Corsair RM750x

The best all-around power supply for your needs

Form factor: ATX | Capacity: 750W | Efficiency rating: 80 Plus Gold | Modularity: Full | Warranty: 10-year

Zero-RPM fan mode
Modular Cables
 750w max capacity small for power gamers

The Corsair RM750x scores the top spot on this list for one simple reason: it’s the most well-rounded power supply you can buy today. On top of a 10 year warranty and an 80 Gold Plus efficiency rating, the Corsair has a fully modular cable system. This means you only need to install the cables you need – you can say goodbye to the mess of cables and shoddy airflow that non-modular PSUs endure. 

Best budget power supply: EVGA 500 B1

Everything you need to get started

Form factor: ATX | Capacity: 500W | Efficiency rating: 80 Plus Bronze | Modularity: None | Warranty: 3-year

Low price
6 SATA cables
500w rating

When you’re trying to keep the price of your PC build similar to that of a console, you don’t have a lot of choices for budget power supplies that don’t suck. In these situations, economical options like the EVGA 500 B1 are a lifesaver. For less than the cost a AAA game, you can expect 500 watts of power transmitted through several SATA cables and two PCIe slots – it covers the bare essentials without ignoring the needs of its audience. The three-year warranty is just gravy.  

  • This product is only available in the US and UK at the time of this writing. Australian readers: check out a fine alternative in the Corsair RM750x 

Best silent power supply: be quiet! Straight Power 10

Quiet as the night

Form factor: ATX | Capacity: 400W – 700W | Efficiency rating: 80 Plus Gold | Modularity: Semi | Warranty: 5-year

Quiet  ATX and EPS support
A little pricey across capacities

Even the best PSUs seem to have extremely loud fans, and unlike case fans, it’s not exactly easy to replace them. Luckily, the Straight Power 10 line-up runs nice and quiet. Options range from 400w to 700w, and they’re SLI and Crossfire certified. They’re also modular, meaning you only need to use the cables that are necessary for your build.  

Best compact power supply: Silverstone SFX Series SST-SX550

Perfect for Micro ATX and Mini ITX PC builds

Form factor: SFX | Capacity: 550W | Efficiency rating: 80 Plus Gold | Modularity: None | Warranty: 3-year

Compact size
ATX and EPS support
Limited number of connectors

The best power supplies have a tendency to be over-sized, taking up way too much space in your PC. However, these days there are plenty of compact pc power supplies that still provide plenty of juice. The Silverstone SX550 is almost half the size of other power supplies, so that you can better facilitate cables and airflow inside your case. Ths makes it the perfect case for micro ATX and mini ITX builds, and you can even slide it into a mid or full-size tower as well, if you feel like it. 

Best high capacity power supply: Corsair AX1500i

Monster power

Form factor: EPS | Capacity: 1500W | Efficiency rating: 80 Plus Titanium | Modularity: Fully | Warranty: 10-year

Titanium efficiency rating
Monster capacity
Huge price tag
Enormous size

If you’re a serious builder that plans on building an absolute behemoth of a rig, with multiple graphics cards, cooling systems on top of some healthy overclocking, the Corsair AX1500i is the best PC power supply for you. It has the highest possible 80 Plus Titanium efficiency rating, and is fully modular, so you only need to add the cables your build actually requires. 

Best modular power supply: NZXT E650

Sleek and fully modular

Form factor: ATX | Capacity: 650W | Efficiency rating: 80 Plus Gold | Modularity: Full | Warranty: 10-year

Stylish 
10 year warranty 
On the expensive side 

If you’re really trying to maximise the visual appeal of your build, a modular power supply is almost essential – you can avoid all of those messy looking wires cluttering up your case. The NZXT E650 takes things a step further. Not only is it a fully modular power supply, meaning you only need to connect the wires you actually need, but it’s also extremely attractive itself, begging to be shown off in your case. This is all topped off with an 80 Plus Gold efficiency rating and a 10-year warranty – not only will it look good, but it’ll deliver power efficiently and last forever while it does it. 

Best RGB Power Supply: Thermaltake Smart RGB 700W

Bright lights and high voltage

Form factor: ATX | Capacity: 700W | Efficiency rating: 80 Plus | Modularity: No | Warranty: 5-year

 Beautiful RGB lighting 
 Inexpensive 
 Not modular 

In 2018, if your PC isn’t strapped to the nines with RGB lighting, you’re not trying hard enough. Enter the Thermaltake Smart RGB 700W – not only does it have beautiful, addressable RGB lighting, but it also features a reliable 80 Plus efficiency rating and enough power to support even the best gaming PCs. Yeah, it’s not modular, but at less than a hundred bucks, we’re willing to look the other way – especially with that sick lighting. 

Bill Thomas and Gabe Carey has also contributed to this article