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Refurbished: For THERMO EOS Switching Power Supply LFWLT150-1003-K
$529 .00
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Refurbished: UCS C200 CPB09-031A Server Power Supply R2X0-PSU2-650W-SB
$139 .00
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Refurbished: For MRW-6420P-R 398W
$132 .00
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Refurbished: 1Pcs for 3910 3710 3901 T3660 701 Power Supply
$148 .00
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Refurbished: 1pcs For R7525 R7625 R760 R770 T660 2800W Server Power Supply 12V Output
$851 .00
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Refurbished: For LSQM1AC650/PSR650-A Power Supply PSR650-D
$176 .00
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Refurbished: 1PCS fo ENP-7130B2 300W/EFAP-M301 flex small 1U industrial control server ...
$147 .00
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Refurbished: KHACHIMO 4.2V60A 300W Switching Power Supply GW-RSP300WV4.2
$239 .00
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Refurbished: 3200W Power Supply TET3200-12-069RA
$479 .00
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Refurbished: 1PCS for 10-Pin power supply HK350-12PP PCE026 FSP250-30AGBAA
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Refurbished: KHACHIMO New Power Supply For TDK-LAMBDA CWS600S1 12V24V 600W ...
$459 .00
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Refurbished: X3550M4 X3650M4 X3630M4 550W Power Supply 43X3312 94Y8112 94Y8105
$59 .00
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Refurbished: For CAP200D3 1A LG27803 810-00002-00-3 Device Power Supply
$213 .00
Refurbished: 1PCS for P720 server power supply 12V130A 1725W 00E7187 7001490-J000
$81 .00
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Refurbished: 1Pcs for R1V2-5275V4H R1V-2275V Server Power Supply 275W
$118 .00
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Refurbished: For DL160g5 AC-063-1 A Power Backplane 450349-001 453652-001
$118 .00
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Refurbished: For YM-2461A YM-2461AAR YM-2651Y YM-2651R YM-2651K KAR Power ...
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Refurbished: For SUN StorEdge 3310 3510 disk array cabinet power supply 370-6776 ...
$209 .00
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Refurbished: KHACHIMO RX200S7 RX300S7 450W Switching Power Supply DPS-450SB B ...
$79 .00
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Refurbished: 1pcs for DS460S-3 DS460SDC-3 PWR-460DC-R PWR-500DC-F AC/DC Power ...
$194 .00
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Refurbished: For HS21 39Y7360 39Y7400 74P4453 8677 Power supply 2000W
$206 .00
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Refurbished: KHACHIMO 851 Industrial Control Power Supply Single 12V 2U 2000W Mining ...
$299 .00
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Refurbished: KHACHIMO 4Pin 260W Power Supply PA-2251-5HK-HPF L70041-001 ...
$139 .00
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Refurbished: For FSP250-50GUB FSP100-50GUB FSP150-50GUB FELX Small 1U Power ...
$81 .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.