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Refurbished: Power Supply for FSP Group FSP350-60PFG 350W
$109 .00
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Refurbished: Power Supply For HY122R1GN Tested Well
$329 .00
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Refurbished: Power Supply Module For HD11010-5 ER11010/S
$699 .00
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Refurbished: 1600W Power Supply EMC-S-1600ADE00 071-000-701-01
$549 .00
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Refurbished: New Power Supply GE Power Supply CS426 CC109153004 14CS09832279 ...
$899 .00
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Refurbished: 1PCS for DPS-410AB-2 A Recorder POE Power Supply 410 Watts
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Refurbished: Aruba S3500 350W Power Supply PSU-350-AC DCJ3501-03PLF
$359 .00
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Refurbished: 1Pcs for hard disk video recorder monitoring power supply DPS-75VB ...
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Refurbished: 200W Power Supply PC12U-200P-X2SV
$529 .00
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Refurbished: New Power Supply 12V1.5A Power Supply KB-5150
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Refurbished: KHACHIMO 500W Power Supply DPS-500AB-13 A DPS-500AB-13A ...
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Refurbished: 5000 175W Power Supply 01K9862 01K9869 DPS-175GB A
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Refurbished: EX4500 EX4500-PWR1-AC-FB EX4500-PWR1-AC-BF DS1200-3-002 ...
$469 .00
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Refurbished: KHACHIMO Small 1U 270W Switching Power Supply FSP270-60LE FSP220-60LB ...
$139 .00
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Refurbished: For 1200W server power supply DPS-1200TB A G18593-007
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Refurbished: For ASTEC Power Supply For LPS254-CF
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$1,599 .00
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Refurbished: 1Pcs for R4875G1 R4875G5 Communication Power Supply 48V75A 4000W
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Refurbished: KHACHIMO OptiPlex 390 790 990 3010 7010 9010 Power Supply D240ES-00 ...
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Refurbished: 7989 P510 P51A P510Q 700W Power Supply 7000967-Y000 39J4710 97P5834 ...
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Refurbished: LEB100F-0524 R For COSEL Switching Power Supply Output 5V 5A/24V 4A (7A)
$259 .00
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Refurbished: UCS C200 CPB09-031A Server Power Supply R2X0-PSU2-650W-SB
$139 .00
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Refurbished: KHACHIMO 380G9 GEN9 800W Power Supply HSTNS-PL41 720479-B21 ...
$299 .00
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Refurbished: 1Pcs for R48-3500E Communication Power Module 53.5v50A
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Refurbished: For DPS-800QB A Server Power 856-851445 856-814
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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.