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Replacement power supply for 12V LaCie n2870 External hard drive
$22.49
Seasonic S12III 500 SSR-500GB3 500W 80+ Bronze Power Supply, ATX12V & EPS12V, Direct ...
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AT 450W Power Supply for AG-230T PS2POWER230 6+6 PIN AT P8/P9 AT45.8
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trimble tds tsc2 ac wall charger, oem factory power supply
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Corsair CX750F RGB, 750 Watt, 80 Plus Bronze, Fully Modular RGB Power ...
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Genuine 300W Bestec ATX0300D5WC Power Supply for ATX-300-12Z P/N 585008-001
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Genuine XW600 XW601 Replacement 250 Watt - 300 Watt Power Supply Power Brick PSU, For ...
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Power Supply Replacement for HP Compaq 5188-2625 5188-2627 5188-2626 5187-5008
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Replacement power supply for 9V Novation Bass Station Rack
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CORSAIR CX-F RGB Series CX650F RGB 650W 80 PLUS Bronze Fully Modular ATX Power Supply, ...
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Antec NeoECO Gold Zen NE700G Zen Power Supply 700W, 80 PLUS GOLD Certified with 120mm ...
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EVGA SuperNOVA 1300 P+ 220-PP-1300-X1 1300 W ATX12V / EPS12V 80 PLUS PLATINUM ...
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COOLMAX CM-300 300 W Micro ATX Power Supply
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ASUS ROG-STRIX-850G 850 W ATX12V 80 PLUS GOLD Certified Full Modular Active PFC Power ...
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Segotep 600W Power Supply ATX 80 Plus Gold PSU with Silent 120mm Fan
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Super Flower Leadex Platinum 1600W 80+ Platinum, 10 Years Warranty, ECO Fanless & Silent ...
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Replacement power supply for 12V Waldorf microQ Rack (blue) Synth
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Cooler Master MWE Bronze 500 80+ Bronze 500W PSU with 120mm Silencio FB Fan, Sleeved ...
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Raidmax Vortex Power RX-600AC-V 80 Plus White Non-Modular ATX/12V EPS/12V 600W ...
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EVGA 700 GD 100-GD-0700-V1 700W ATX12V / EPS12V 80 PLUS GOLD Certified Non-Modular ...
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EVGA SuperNOVA 1000 G3 220-G3-1000-X1 1000W ATX12V / EPS12V SLI Ready CrossFire ...
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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.