Before you set out to build a new PC, you should find the best power supply for your build, as it really is critically important. They might not be as exciting as the best graphics card, but every PC component will rely on the power supply for, well, power. You don’t want to compromise on your power supply, even if it does mean you’ll have less cash for one of the best processors.
Still, finding the best PC power supply doesn’t have to cost an arm and a leg. Even if you’re trying to save some cash, you can find a great deal on many of the best PSUs. Don’t worry, there are still high-end power supplies, rocking all the RGB lighting you’d expect and enough power capacity to power a small village – or one of the best gaming PCs with two RTX 2080 Tis in SLI. No matter what you’re looking for, you’ll find the best power supply for your build right here.
And, you’re going to want to find the best one. Having a PC power supply die on you is a terrible experience, and many of the symptoms of a dying power supply can slip by unnoticed. The worst silent killer could be as subtle as some lost power efficiency, leading to your PC to outright refuse to turn on one day. By the time you notice your PSU is starting to die, it may be too late. So, don’t wait until you have a power crisis, pick up one of the best PC power supplies today, so it doesn’t fail tomorrow.
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
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
If you’re looking for an affordable power supply that doesn’t suck, there aren’t a lot of options out there. In situations like this, an economical option like the EVGA 500 B1 might be right up your alley. For less than the cost of a AAA game, you can expect 500 watts of power transmitted through several SATA cables and two PCIe cables. This is one of the best power supplies because it covers the bare essentials and nothing more, which is exactly what a budget part should do. The three year warranty is just the cherry on top.
- 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
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
The best PC power supplies unfortunately tend to be giant hunks of metal that don’t fit into smaller PC cases. However, the Silverstone SFX SST SX550 is a compact power supply that fits in plenty of cases. It’s half the size of most of the other PSUs on this list, allowing for more room for better airflow. This makes it an easy pick for anyone building a mini ITX or micro ATX build, and you can even slide it into a mid- or full-tower, if you feel like it. And, with small form-factor PCs being all the rage in 2018 – it’s easy to see why the Silverstone SFX is one of the best PC power supplies.
Best high capacity power supply: Corsair AX1500i
Form factor: EPS | Capacity: 1500W | Efficiency rating: 80 Plus Titanium | Modularity: Fully | Warranty: 10-year
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
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
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.
- Pick up the best processors while you're at it
Bill Thomas and Gabe Carey has also contributed to this article