Power Supplies - Showing 1825 - 1848 of 17931 Products

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Refurbished: Dell Optiplex 390 790 990 3010 Small For Factor SFF Computer Power Supply ...
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Refurbished: Dell-IMSourcing 7GC81 DS H250AD-00 Proprietary Power Supply
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Refurbished: Dell Precision T5610 T5810 T7810 685W 80+ Gold PSU H685EF-00 Power ...
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Refurbished: Dell Alienware Aurora R5 R6 850W Modular Power Supply N1WJD
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Refurbished: Genuine Dell Inspiron 3880 200W Sff Power Supply Cgfjt / D200E007L / ...
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Refurbished: HP 480720-001 475 W Micro ATX Power Supply
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Refurbished: 438202-002 HEWLETT-PACKARD POWER SUPPLY FOR DL580 G5
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Refurbished: DELL HK595 305 W Power Supply
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Refurbished: Genuine Dell 280W Power Supply PSU H790K H797K M618F D233N H235PD-01 - ...
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Refurbished: J9738A HP X332 575W 100-240 V AC to 54 V DC Power Supply Kit J9738-61001
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Refurbished: SuperMicro PWS-1K41F-1R 1400W Server Power Supply 80Plus Gold
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Refurbished: Genuine DELL PRECISION 5820 7820 950W POWER SUPPLY CXV28 WGCH4
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Refurbished: DELL X9072 280 W Power Supply
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Refurbished: DELL PW116 235 W ATX12V / MicroATX Non-Modular Power Supply
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Refurbished: Dell 530 546S 220s 230 560S V200 power supply ...
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Refurbished: DELL P192M 305 W ATX Power Supply
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Refurbished: HP 613762-001 240 W ATX Power Supply
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Refurbished: NEW Genuine Dell Inspiron 3847 3000 Series 300W PSU Power Supply 5V0JP ...
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Refurbished: DELL KH624 375 W Power Supply
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Refurbished: HP 240W Power Supply ProDesk/EliteDesk 600 800 G1 SFF PSU 702307-002 ...
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Refurbished: Dell Optiplex 620 390 790 990 265W Power Supply F265EM-00 AC265AM-00 ...
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Refurbished: Dell Optiplex 3060 5060 3070 Inspiron 3470 200W Power Supply H200EBS-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.