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Refurbished: For BES-540C BPS-400SP GT460 FSP230-60PNA (PF) FSP250-60AHNAA Power ...
$176 .00
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Refurbished: KHACHIMO Standard 1U 200W Switching Power Supply HK303-11UEP
$179 .00
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Refurbished: KHACHIMO For XP X9-4U4U 560uF420V Power Supply 003-102120-01-017
$1,399 .00
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Refurbished: KHACHIMO 24V10A 240W Power Supply DRL-24V240W1AA
$199 .00
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Refurbished: MA356 DPS-980AB A 614-0383 980W Ma970 A1186
$79 .00
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Refurbished: TDPS-600CB G 600W RS500 I610r-G Server Power Supply
$139 .00
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Refurbished: KHACHIMO 1U 200W Power Supply FSP200-50PLA FSP180-50PLA ...
$99 .00
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Refurbished: 1Pcs for ST-270FUB 270W FLEX Small 1U Power Supply
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Refurbished: 1Pcs for FSP330-AAAN3 FSP096-AHB FSP090-AHAT2 FSP330-AJAN3 adapter ...
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Refurbished: For ACBEL 10Pin 75W Power Supply SFXA1071A
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Refurbished: KHACHIMO Power Supply For VAPEL 53.5V AD162M53.5-1M11
$559 .00
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Refurbished: C240 C220 M3 Server Power Supply UCSC-PUS-650W V02 PS-2651-1-LF
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Refurbished: ProDesk 400 600 690 800G1 G2 6Pin 240W Power Supply PS-4241-2HC ...
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Refurbished: 1Pcs for 45W8270 DS8000 Series 5/12V PPS DDM Power Module
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Refurbished: KHACHIMO 80plus Bronze FLEX 1U 300W Switching Power Supply SSP-300SUB ...
$259 .00
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Refurbished: For TDK-Lambda EMC 20A 220V RSHN-2020
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Refurbished: MX104 Power Supply PWR-MX104-DC-S-D 740-045932 700-010684
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Refurbished: For B540P Power Supply FSP250-30SI DPS-250AB-84 B APC005 APB001
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Refurbished: For 24-pin power supply PS-5241-03 HK340-71FP PS-5241-02 PC9053 240W
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Refurbished: 1PCS for TC4600 Power Supply DS 2000-3 - 002 DS 2000-3 2000W Server Power ...
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Refurbished: 1PCS for 80Y9081 60Y0621 39Y9661 39M4945 44X3058 80Y9080 module
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Refurbished: PCSA-300P-X2V For NIPRON DC Power Supply
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Refurbished: KHACHIMO 400W Medicel Power Supply TMPC-400 FSP400-70MP
$799 .00
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Refurbished: 1Pcs for wall-mounted boiler, thermostat HRT-186
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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.