Building your own PC or planning to upgrade some components and don't have enough juice? You'll need to take a look at a power supply. There are literally thousands available for purchase, listed in all shapes and prices. Since the power supply is arguably the most important component to any PC, we want to help you find the best power supply for the job.

When looking at power supplies (PSU), don't get too hung up about the wattage. While the amount of power the unit can provide to your system is important when considering just what you'll be able to install, a higher W value on the box won't necessarily mean improved performance. Generally speaking, if you're rocking a single graphics card you won't need anything more than 500W. Here's what you should be considering when looking at your next PSU:

  • 12v Rail amps
  • Overall efficiency
  • Component quality
  • Price
  • Modular cabling
  • Peak power
  • Reputable brand

Power Supplies

It's best to go with what you need as opposed to what you can afford. Seriously, that 1500W unit is pointless unles, are planning to run multiple graphics cards and have multiple people gaming on that one machine simultaneously — or maybe you have more money than ideas as to how to spend it wisely (if so, well done?). CoolerMaster has a neat PSU calculator that can help you work out how much juice you will need.

As well as using the recommended tool above, take a gander at some of our picks below to give you an idea as to what to look for.

Best overall

EVGA SuperNOVA P2

EVGA 650 P2

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Rating: 80+ Platinum

Watts: 650W

This SuperNOVA P2 from EVGA is fully modular, enabling you to route only cables that you need for components, has an Eco Mode and sports the Platinum rating badge, so you know this unit will be able to power even enthusiast rigs.

Bottom-line: Has more than enough power for most PCs and is efficient for some savings.

One more thing: There's a 10-year warranty with this particular PSU.

Why the SuperNOVA P2 is a superb PSU

The SuperNOVA P2 combines the best in efficiency with quality components and brilliant features, matched by a 10-year warranty.

The SuperNOVA P2 took our #1 spot for PSUs simply because it represents a solid balance between affordability, efficiency and available features. Whether you're looking at the platinum 80+ efficiency rating or 10-year warranty, it's a superb option for anyone looking to provide more power to their PC for upgrades or start scratch with a new build.

It's also quiet. Real quiet. If you're going for a near-silent water-cooled setup and require a PSU that has the ability to run without a fan up to a certain draw amount (and don't particularly want a fanless unit), the SuperNOVA P2 is an ideal choice. Even when the fan kicks in it's difficult to hear the blades spin from a distance.

You really can't go wrong with the 650W SuperNOVA P2, which packs more power than you'll likely need.

Reliable Second

SeaSonic G Series

SeaSonic G Series

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Rating: 80+ Gold

Watts: 550W

SeaSonic is a well-known brand in the PSU industry. Not only does the company sell its own units, but other manufacturers use its platforms for competing PSUs. The G Series is SeaSonic's high-end, performance line of power plants and the 550W unit is more than enough for most PCs.

Bottom-line: Perfect if you're after silent performance.

One more thing: It's SLI and CrossFire ready for multiple GPU setups.

Budget power supply

EVGA 430 W1

EVGA 430 W1

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Rating: 80+ White

Watts: 430W

EVGA's more affordable power supplies leave out the more fancy features like modular cabling to bring the price down to an absolute minimum. Sure, it's cheaper than other PSUs on the market and the efficiency rating isn't the best, but at just $32, this is a safe bargain for those on a tight budget.

Bottom-line: The 430 W1 proves you don't need to spend the big bucks for a decent PSU.

One more thing: Also available with 500W for $37.48.

So much power

Corsair HXi Series

Corsair HXi

See at Amazon

Rating: 80+ Platinum

Watts: 1000W

While we did state above that you don't really need anything more than 500W for your gaming PC, there are those rare times when you need quite a fair amount of electricity. To supply all this energy to an insane enthusiast build, Corsair's HXi Series — specifically the 1000W option — will be more than enough. There are 850W and 750W varaints of the HXi available.

Bottom-line: Ideal for enthusiast setups and power-hungry rigs.

One more thing: Don't get this unless you really need it. We don't want you to waste your money on more than you need.

Best overall power supply

EVGA SuperNOVA P2

EVGA 650 P2

See at Amazon

Rating: 80+ Platinum

Watts: 650W

This SuperNOVA P2 from EVGA is fully modular, enabling you to route only cables that you need for components, has an Eco Mode and sporting the Platinum rating badge, you know this unit will be able to power even enthusiast rigs.

Bottom-line: Has more than enough power for most PCs and is efficient for some savings.

One more thing: There's a 10-year warranty with this particular PSU.