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Refurbished: SuperMicro PWS-1K28P-SQ 1280W Hot Swap 80+ Plus Platinum Server Power ...
$56 .95
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Refurbished: Supermicro PWS-721P-1R 720W Redundant Power Supply
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Refurbished: Dell 82DRM OptiPlex 3050 5050 7050 180W Switching Power Supply 63-4
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Refurbished: HP 626409-001 600W Power Supply for Z400
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Refurbished: HPE 466610-001 ATX12V Power Supply
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Refurbished: Juniper PWR-MX480-2520-AC-S PWR-MX480-2520-AC-S Proprietary Power ...
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Refurbished: HP 437573-B21 1200W DC Power Supply
$528 .00
Refurbished: For 600W Z420 Power Supply DPS-600UB A, 623193-001 632911-001
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Refurbished: For G9 1400w Power Supply DPS-1400CB A 720620-B21 733428-101 ...
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Refurbished: H3C DC 150W Switching Power Supply PSR150-D1 LSPM5150D
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Refurbished: KHACHIMO A7000 A710 S300 500 700 W4600I E4200i E4920i E2600i 130W ...
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Refurbished: EPAP-420 Server Power Supply 100V-240V MAX 420W
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Refurbished: KHACHIMO FSP 80plus ITX FLEX Small 1U K39 49 T34 R47 44 M41 A35 S3 ZS-A4 ...
$119 .00
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Refurbished: 1280W Switching Power Supply PWS-1K28D-240
$359 .00
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Refurbished: For PS6100 SP Controller PN: 07V250 E09M001 07V250 1pcs
$176 .00
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Refurbished: Switching Power Supply SPR1CA3508
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Refurbished: R710 870W Server Power Supply N870P-SO A870P-00 07NVX8 0YFG1C
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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.