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Refurbished: X3650 m2/M3 X3550 460W 675W Power Supply 39Y7236 39Y7222 39Y7228
$99 .00
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Refurbished: 100W Power Supply PSC100-A-1 FSP100-1E02
$219 .00
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Refurbished: 02312VFB power supply PDC1800S12-B1 switch power supply 1800W DC
$179 .00
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Refurbished: KHACHIMO CRPS 800W Switching Power Supply DPS-800AB-30 C ...
$439 .00
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Refurbished: 1PCS for M1R-2400V/2500G R1V-2275V R1U-2220V M1S-3500V/3400V ...
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Refurbished: KHACHIMO 380 388 G6 G7 G8 460W Power Supply DPS-460MB A HSTNS-PD28 ...
$189 .00
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Refurbished: POWERPACK 48/5800 241246.500 For Eltek Communication Power Supply
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Refurbished: 1Pcs for FSP1200-20FM server power supply 1200W power supply 9PA12A2700
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Refurbished: For SUN Netra 240/440 Mini DC Power Supply 300-1567 300-1845
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Refurbished: DL160G5 Server Power 650W DPS-650MB A 457626-001 446635-001
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Refurbished: RPS-400-18-SF Switching Power Supply 400W 18V 22.3A
$149 .00
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Refurbished: R4850G Communication Power Module
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Refurbished: NF5220 NF5240M3 GW-2U600 600W 24+8+8 pin server power supply
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Refurbished: KHACHIMO DC 360W Power Supply PSC360-D
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Refurbished: For 3Y 2U Power Supply YH-5301E
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Refurbished: 1PCS for W530 S26113-E567-V50-02 DPS-500XB A
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Refurbished: Complete Set For 3Y YH-8451B Redundant Server Power Supplies
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Refurbished: PBA1000F-24/12/48 DC Power Supply
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Refurbished: 1Pcs for PWS-1K11P-1R 1010W Redundant Power Supply Module ...
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Refurbished: KHACHIMO WS-C2960XR-24TS 250W Power Supply PWR-C2-250WAC ...
$539 .00
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Refurbished: For SAK250L-F4-GA03-0000FF JSA1500 SAK250L-F4 Power Supply
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Refurbished: KHACHIMO C3660 router power supply 34-0877-01
$149 .00
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Refurbished: KHACHIMO AT P8P9 200W Switching Power Supply ACE-925A-RS ACE-925A
$559 .00
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Refurbished: 1PCS for EN4093 49Y4273 49Y4272 module 00D5826 00D5825
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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.