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PAX S300 Power Supply (200310110000025)
$116 .99
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APEVIA SFX-AP400W Mini ITX Solution / Micro ATX / SFX 400W Power Supply
$54 .99
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$54 .99
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JPS300P-A5.0V G-Energy Best Price 5V 60A 300W Power Supply G-Energy JPS300P-A5.0V
$135 .99
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RadioDesignLabs RDL PS-24KS North American Power Supply 24 Vdc 1000 ...
$71 .99
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PSU for 3020 7020 9020 255W Power Supply L255AS-00 AC255ES-00/01 HU255AS-00 ...
$125 .99
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Dell Optiplex 390 790 990 3010 7010 9010 SFF Computer Power Supply 240 Watt CCCVC ...
$58 .20
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SST-SX650-G v1.1
$191 .99
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ePOWER EP-550-TD1 550 W ATX12V Active PFC Power Supply
$49 .99
SPI Power Supply ATX-450PN-B204 450W ATX2.2 (12V) Ball Bearing Fan 20? 2xSATA ...
$162 .99
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MW Mean Well SP-320-24 24V 13A 312W Single Output with PFC Function Power Supply
$186 .99
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[PowerNex] Mean Well MSP-300-36 36V 9A Enclosed-PFC Medical Power Supplies
$243 .99
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RAIDMAX Vortex 500W or 700W ATX 12V v2.3 / EPS 12V SLI Ready Crossfire Ready 80 Plus ...
$108 .99
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$108 .99
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Seasonic FOCUS PX-850, 850W 80+ Platinum Full-Modular, Fan Control in Fanless, Silent, ...
$306 .99
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Zippy Emacs HG2-6400P 400W 24 Pin 4/8 Pin +12V Desktop Power Supply 2001120072
$334 .99
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Vbestlife PC Power Supply, 600W Desktop Computer Parts, Computer Power, Adjustable ATX ...
$118 .99
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Allied 250W Power Supply
$170 .48
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CableMod C-Series Pro ModMesh Sleeved Cable Kit for Corsair RM Black Label/RMi/RMX ...
$180 .99
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LED Driver 151.2W 24V 6.3A LPVL-150-24 Meanwell AC-DC SMPS LPVL-150 Series MEAN WELL ...
$99 .99
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Antec SL350 350 W ATX Power Supply
$95 .00
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QP-200F
$250 .99
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HPE 283623-001 Redundant AC Power Supply
$69 .10
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HKI350-120NB for Industrial Power Supply 350W Single Output 12V
$231 .99
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XPG CORE Reactor 650Watt 80 Plus Gold Certified Fully Modular Power Supply ...
$180 .99
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Seasonic SS-350SFE 350W Active PFC Power Supply
$171 .99
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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.