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Refurbished: KHACHIMO Power Supply STL1FANAF
$549 .00
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Refurbished: For TDI POWER SUPPLY MER27HIB-P57X00-LF Power Module 2700W
$1,099 .00
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$1,099 .00
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Refurbished: KHACHIMO 350W Power Supply HXPAD350-220S28-01R1
$659 .00
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Refurbished: For host power supply PCSF-160P-X2H
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$1,029 .00
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Refurbished: KHACHIMO 12V25A Power Supply PQ60120QEB25NNH
$139 .00
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Refurbished: 1Pcs for SFXA5201A SFXA5201B 2U chassis power supply
$119 .00
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Refurbished: S8VK-C24024 Switching Power Supply 240W/24V Output DIN-Rail
$99 .00
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Refurbished: KHACHIMO 300W Peak 400W Switching Power Supply SD-3450U/2U ...
$249 .00
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Refurbished: KHACHIMO PSU For FSP 300W Switching Power Supply FSP300-60AU
$249 .00
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Refurbished: 06118Y Storage Power Supply EMA-BXG100-01-C017000224-0000
$229 .00
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Refurbished: HNJC4 J50TW JNPVV PH3C2 RV1C4 T5VF6 1GC38 3WN11 Power Supply
$89 .00
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Refurbished: SPR1C350 Array Networks APV 5200 3520 350W Module Power Supply
$139 .00
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Refurbished: AC Power Module H3C AC-PSR350-A10-H3 PSR350-A10 AR4640 4680
$198 .00
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Refurbished: KHACHIMO Power Supply Power-One 150W Power Supply MPU150-4350
$339 .00
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Refurbished: 1pcs for FSP400-80AGNBR 400W Power Supply
$642 .00
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Refurbished: KHACHIMO PE2950 2970 750W Power Supply Z750P-00 N750P-S0 NPS-750BB ...
$229 .00
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Refurbished: For CWT PSB250Q-J3 Power Supply 250W PSB250Q-J3
$259 .00
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Refurbished: For MVP600 MVP500 Power Supply HK700-34FP HK600-34FP Rated 600W
$235 .00
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Refurbished: For NetApp FAS270 Power Supply, GF270 FAS250 PN: X511A-R5 114-00012
$220 .00
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Refurbished: RPS-400-18-SF Switching Power Supply 400W 18V 22.3A
$149 .00
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Refurbished: 1Pcs for Z440 DPS-525AB-3 A 753084-001 758466 Power supply 525W
$191 .00
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Refurbished: 1Pcs for XSG3365000 HCG-850M FSP180-55SFX FSP200-20SI AC180ES-00 ...
$239 .00
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Refurbished: 1Pcs for PWS-1K11P-1R 1010W Redundant Power Supply Module ...
$368 .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.