The power supply unit (PSU) is the heart of every PC. It takes AC power from the wall and converts it to low-voltage DC power, which then goes on power to all your components. So if you want reliable, steady power to your motherboard, CPU, RAM, graphics cards, drives, fans, (and of course!) RGB lights, you need to get a good power supply. From the affordable PSU to absolute powerhouses able to run two systems at the same time, we’ve picked out the best power supplies available today.TL;DR These are the Best Power Supplies:
1. Corsair RMx Series 750x
Best Power Supply
Max Power: 750W Modular: Full Efficiency: 80 Plus Gold Connectors: 1 x ATX 24-Pin, 2 x EPS, 4 x PCIe, 9 x SATA, 8 x Peripheral, 1 x Floppy Dimensions: 3.39″ x 5.91″ x 6.30″
For just over $100, you can get an efficient and reliable power supply that will deliver more than enough juice for a modern gaming PC, even one with high-end components and a little modest overclocking. Only those who have multiple high-end graphics cards or extremely power-hungry (and overclocked) CPUs are likely to need more power than this one offers.Corsairs RMx series has all-Japanese capacitors rated up to 105 degrees celsius. Its 80 Plus Gold certified, and even has a zero RPM fan mode to run completely silently when not under heavy load. The pricier RMi series adds a digital interface for monitoring software and fancy fluid dynamic bearings, but those are probably not worth the extra money for most people.
2. EVGA 500 B1
Cheap Power for Budget PCs
Max Power: 500W Modular: None Efficiency: 80 Plus Bronze Connectors: 1 x ATX 24-Pin, 1 x EPS, 2 x PCIe, 6 x SATA, 3 x Peripheral, 1 x Floppy Dimensions: 3.35″ x 5.91″ x 5.51″
If youre putting together a budget gaming box, with mid-range processor and graphics card, then you dont need a high-wattage PSU, and you certainly shouldnt shell out big bucks for one. At only $35, this 80 Plus Bronze certified PSU is just what your sub-$800 gaming PC needs. Its cool, quiet, reliable, and provides enough juice for a modest gaming PC. Spend the money you save on more RAM or a slightly faster graphics card.3. Rosewill Hive-750S
A More Powerful Budget PSU
Max Power: 750W Modular: Full Efficiency: 80 Plus Bronze Connectors: 1 x ATX 24-Pin, 2 x EPS, 4 x PCIe, 8 x SATA, 6 x Peripheral, 2 x Floppy Dimensions: 3.36″ x 5.91″ x 6.30″
At only $70, Rosewills Hive-750 is a good pick for those who are building a higher-power system while trying to save every dollar they can. Its only 80 Plus Bronze certified and doesnt have fully silent operation like the Corsair RM 750x, and its only partially modular. But it kicks out up to 54A on the +12V rail, which is plenty for a high-end CPU and even two good graphics cards.4. EVGA SuperNOVA 850 G3
Amazing Performance for High-Power PCs
Max Power: 850W Modular: Full Efficiency: 80 Plus Gold Connectors: 1 x ATX 24-Pin, 2 x EPS, 6 x PCIe, 9 x SATA, 4 x Peripheral Dimensions: 3.35″ x 5.91″ x 5.91″
EVGA has been just killing it in the power supply business lately, and the SuperNOVA G3 line is one of its best. For a pretty reasonable price you can get an 850-watt unit that is small, fully modular, 80 Plus Gold certified, and offers a whopping 10-year warranty. Reviewers are falling all over themselves praising the performance of EVGAs new G3 power supplies, saying they perform as well as Seasonics fantastic PRIME series (which cost considerably more).If theres one little nit to pick, its that at really high load the fan supposedly gets a little louder than some competiting models. But at low-to-mid loads its nearly silent, and with this quality and efficiency you probably wont ever really run up against sustained full-load situations in practice.
5. EVGA SuperNOVA 1200 P2
For Seriously Beefy PCs
Max Power: 1200W Modular: Full Efficiency: 80 Plus Platinum Connectors: 1 x ATX 24-Pin, 2 x EPS, 6 x PCIe, 12 x SATA, 5 x Peripheral, 1 x Floppy Dimensions: 3.35″ x 5.90″ x 7.87″
Look, odds are you dont need a power supply that can produce more than a kilowatt of power. Only those who have overclocked high-end CPUs, and multiple overclocked graphics cards, and tons of RAM, and lots of other power-hungry parts are going to need this. If thats the kind of system youre putting together, its easy to recommend the EVGA SuperNOVA 1200 P2 80+ PLATINUM.What’s crazy is this isn’t even the largest available model. EVGA sells a 1600W PSU in the same line, with a similarly tremendous price tag of almost $450. If you’re after that much juice to power your rig, be careful you don’t rip a hole in the space-time continuum.
What to look for in a Power Supply
Its tempting to simply think more is better and go for the highest wattage number you can find. This would be a big mistake. A 1200-watt power supply is not necessarily higher quality than a 650-watt one, and definitely not the right choice for a system that wont use nearly that much power.The wattage rating on a PSU describes how much power it can supply, but there are plenty of caveats. Some PSUs may supply a lot of peak power in total, but not enough to the critical components. Or, as temperatures rise, power delivery may become unreliable. There are dozens of PSU calculators out there, and using one can be a good place to start. Many of them recommend way more PSU than you really need out of an abundance of caution. If youre not going crazy with overclocking or multiple top-end graphics cards, you probably dont need a big ol 850-watt power supply.
Of course, the efficiency by which the PSU converts AC to DC is very important. Youll typically see one of three different 80 Plus ratings on power supplies: Bronze, Silver, and Gold. There are Platinum and Titanium ratings too, but they are more rare. To be 80 Plus certified, a PSU must deliver at least 80% efficiency at 20%, 50%, and 100% of the maximum rated load. The higher the rating, the further above 80% the PSUs efficiency. A more efficient power supply will generate less heat and draw less power from the wall, so its often worth the extra expense.