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CORSAIR RMx Series RM750x CP-9020179-NA 750W ATX12V / EPS12V 80 PLUS GOLD ...
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Sparkle Power ATX12V & EPS12V Power Supply
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SPARKLE FSP300-60ATVS 300W ATX12V 300W PS2 ATX12V Low Noise P4 Ready & AMD ...
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EVGA SuperNOVA 850 G5, 80+ GOLD 850W, 10 Year Warranty, Power Supply 220-G5-0850-X1
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$159.99
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CORSAIR RMx Series RM550x CP-9020177-NA 550W Power Supply
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$109.99
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CORSAIR HXi Series HX750i 750W 80 PLUS PLATINUM Haswell Ready Full Modular ATX12V & ...
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SeaSonic 80 Plus Bronze SS-600ES 600W ATX12V v2.31 Power Supply
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EVGA 600 BR 100-BR-0600-K1 600W ATX12V / EPS12V SLI CrossFire 80 PLUS BRONZE ...
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SeaSonic SS-1050XP3 1050W ATX12V / EPS12V 80 PLUS PLATINUM Certified Full Modular ...
$249.99
ENERMAX ERV1000EWT-G 1000W ATX12V v2.3 / EPS12V v2.92, v2.8 SLI Certified CrossFire ...
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LEPA G1600-MA ATX12V 1600W Gold PSU
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APEX AL-8250SFX 250W SFX12V Ver.3.1 Power Supply
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EPower Power Supply EP-700PM 700W ATX/EPS 12V 120mm Fan 8 x SATA 2 x PCI Express Bare
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Rosewill ARC Series 450W Gaming Power Supply, 80 PLUS Bronze Certified, Single +12V Rail, ...
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$59.99
$51.99
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CORSAIR SF Series SF450 450W 80 PLUS GOLD Active PFC SFX SFX12V Micro ATX Full Modular ...
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EVGA 400 N1 100-N1-0400-L1 400W ATX12V / EPS12V Power Supply
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250W AC Config 2 Power Supply
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EVGA 750 BQ 110-BQ-0750-V1 750W Consumer Electronics 80 PLUS BRONZE Certified ...
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RAIDMAX XT series RX-400XT 400W ATX12V / EPS12V Power Supply
$35.99
CORSAIR CXM Series CX450M CP-9020101-NA 450W ATX12V / EPS12V 80 PLUS BRONZE ...
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$74.99
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EVGA SuperNOVA 220-T2-1600-X1 1600W ATX12V / EPS12V SLI Ready CrossFire Ready 80 ...
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EVGA 850 GQ 210-GQ-0850-V1 80+ GOLD 850W Semi Modular EVGA ECO Mode Power Supply
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StarTech.com ATX2POWER350 350W ATX12V 2.01 Power Supply
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$51.99
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EVGA 1000GQ 210-GQ-1000-V1 1000W ATX12V / EPS12V SLI Ready CrossFire Ready 80 ...
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EVGA 100-W1-500-KR 500W ATX12V / EPS12V 80 PLUS Certified Non-Modular Active PFC ...
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Tips for Buying a Computer Power Supply Unit (PSU)

Introduction

A computer power supply is one of the most crucial components in a computer, as it is responsible for providing stable and regulated power for the system. If you are shopping for a computer power supply, finding the ideal one will require you to consider several important criteria. Those criteria include the size and form factor of the case, the wattage requirement of the system, efficiency, and your internal cabling preference.

Size Standards

Computer power supplies are available in a variety of different sizes and form factors. It is crucial that the power supply unit (PSU) you select matches the size requirements of your case and motherboard. If you have a Mini ITX case for example, you cannot utilize a standard ATX power supply. For more information about power supply form factors, see below.

  • ATX
    The standard power supply size that will fit most mid-size and full-size tower cases. Some micro ATX cases can utilize ATX power supplies as well.
  • Mini ITX
    Mini ITX power supplies are designed specifically for mini ITX systems but may also fit other small form factor computer cases.
  • SFX
    SFX computer power supplies are smaller than standard ATX PSUs and are meant for micro ATX and other small form factor computer cases.
  • TFX
    Another small form factor computer power supply that is thinner to fit micro ATX, Mini ITX, and other smaller systems.
Wattage

A computer power supply’s wattage rating is a measurement of how much power it can provide to the hardware. When shopping for a power supply, you need to consider how much power your computer system requires. To calculate your system’s power requirement, add up the power draw for all the components.

Start with the motherboard and processor, and then include graphics cards, system memory, storage devices, and other expansion cards. For an even better estimate, you should include USB devices, internal fans, and other accessories. Once you have your estimate, try to find a computer power supply that is capable of at least that. For a larger safety margin, you should get a PSU that is well above that minimum.

Cable Management

There are two cable management options for computer power supplies, modular and non-modular. Modular cabling allows you to connect and disconnect internal power cables from the power supply itself, so you can avoid having unused cables and connectors dangling inside the case. Computer power supplies that feature modular cabling typically cost more than those without it.

Efficiency

The efficiency of a computer power supply is a ratio of how much power it provides and how much power it draws. For instance, a power supply that provides 200 watts of power but pulls 400 watts from a power outlet has a 200/400 or 50% efficiency ratio. The more efficient your computer power supply is, the less it will cost you to operate.

One metric you can use to gauge efficiency is what level of 80 PLUS® certification a power supply has, if it any. The different levels of 80 PLUS certification include 80 PLUS, 80 PLUS Bronze, 80 PLUS Silver, 80 PLUS Gold, 80 PLUS Platinum, and 80 PLUS Platinum. The most basic certification is 80 PLUS, which indicates an efficiency rating of at least 80%. The other certifications rank from Bronze to Titanium, with the latter being the highest attainable. If computer power supply efficiency is a big concern for you, try to find one with a high level of 80 PLUS certification.