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Refurbished: RD650 550 450 350 Server 750W Power Supply PS-2751-3L-LF 03T8615
$109 .00
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Refurbished: DC Power Supply ASR1001-X-PWR-DC
$439 .00
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Refurbished: KHACHIMO Power Supply For 36V9.7A 350W Power Supply SYN-350-S36
$319 .00
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Refurbished: 1PCS for X306 server power supply 300W 26K4106 23K4874 API3FS26
$103 .00
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Refurbished: 1Pcs for 18.5kW compressor variable frequency driver ...
$441 .00
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Refurbished: 1Pcs for DS800-G25 MS3000 MS7000 DPS-770GB A 770W Power Supply
$250 .00
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Refurbished: For FSP084-DMAA1 FSP084-DIBAN2 FSP096-AHAN2 PAC090K FSP090-RSBA
$132 .00
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Refurbished: KHACHIMO Power Supply For HEC 400W 500W For Rapter 400WN RAPTER ...
$569 .00
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Refurbished: 1PCS for FSP1200-20ERM RG-PA1200I-F S6920 S6910 switching power ...
$279 .00
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Refurbished: Power Supply NLP65-7624 100-24VAC
$369 .00
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Refurbished: KHACHIMO 700W Power Supply XCB44BF00P03A Work Like New
$6,499 .00
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$6,499 .00
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Refurbished: 1Pcs for FSP500-60PFG SPI500A8BB FSP500-70PFL Industrial Control Server ...
$283 .00
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Refurbished: 1Pcs for DZY-4850HI (TTI) 48V50A communication power supply, module
$147 .00
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$147 .00
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Refurbished: 875W Power Supply R11A2871A APM12V010F
$329 .00
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Refurbished: Dell L255AS-00 Optiplex 3020 7020 9020 SFF Switching Power Supply 255W ...
$28 .79
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Refurbished: For R910 R510 T710 Power Supply D750P-S0 0CNRJ9 750W
$118 .00
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Refurbished: KHACHIMO 1U 300W Replaceable AIO XPS 2710 2720 Power Supply L260EA-00 ...
$289 .00
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Refurbished: KHACHIMO 3Y HVDC 680W/700W Switching Power Supply YM-2681H
$289 .00
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Refurbished: 280W Power Supply Lite-On PS-5281-02VA-RoHS FRU 45J9433
$89 .00
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$89 .00
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Refurbished: KHACHIMO X4630G 4650 D430 FSP220-30PABA D14-220P2B PS-3221-9AB ...
$59 .00
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Refurbished: KHACHIMO 800W Switching Power Supply MRG-3800V-R
$479 .00
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Refurbished: 1PCS for DPS-750XB A Server Redundant Power Supply 750W E98791-010
$104 .00
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Refurbished: For SUN 300-1340 PEX737-30 360W A1000/D1000 Storage Power Supply ...
$289 .00
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Refurbished: 63W Switching Power Supply DPS-65SB A
$129 .00
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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.