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Small Computer Power Supplies

A computer power supply unit is a component that converts AC power from your wall socket into the stable, consistent DC power that your computer's components need to work. If you're building a new computer or upgrading an old one, you'll want to make sure you get the right power supply unit for your needs. Browse the top-ranked list of small computer power supplies below along with associated reviews and opinions.

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  1. HP - Desktop Mini 65w Power Supply Kit - 65 W - 120 V AC, 230 V AC Input - 1 - Black

    SKU: J3ZT6F9TRY

    I ordered one from Best Buy. Now I can use my Computer again!

    Product Description

    A black power supply kit compatible with select HP Desktop Mini models, supporting 65W output and dual voltage input.
    See all Laptop Chargers & Adapters
    Your price for this item is $29.99
    Save $10
    The previous price was $39.99
  2. SilverStone - SFX Series SST-ST30SF-V2 300 W SFX 80 PLUS BRONZE Certified Active PFC Power Supply

    SKU: J36P26X55L

    Product Description

    A compact black SFX power supply delivering 300W with 80 PLUS Bronze efficiency and active PFC.
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    Your price for this item is $85.49
    Save $1
    The previous price was $86.49
  3. SilverStone - SX700-LPT 700W (Peak 750W) SFX-L 80 PLUS Platinum PFC PSU

    SKU: J36P26X434

    Product Description

    A fully modular SFX-L power supply with 700W output, 80 PLUS Platinum efficiency, and black-silver finish.
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    Your price for this item is $181.49
  4. Thermaltake - Toughpower SFX 750W 80Plus Platinum ATX 3.1 Standard Power Supply - Black

    SKU: J39ZPC9V6V

    Product Description

    A fully modular black power supply featuring 80 PLUS Platinum efficiency and ATX 3.1 compatibility.
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    Your price for this item is $129.99
    Save $32
    The previous price was $161.99
  5. SilverStone - SX1000 Platinum 80 PLUS Platinum 1000W fully modular SFX-L power supply - Black

    SKU: J36P263S6R

    Product Description

    A fully modular black SFX-L power supply delivering 1000W with 80 PLUS Platinum efficiency and PCIe support.
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    Your price for this item is $289.99
  6. CORSAIR - RMe Series RM750e 80 PLUS Gold Fully Modular Low-Noise ATX 3.1 and PCIE 5.1 Power Supply - Black

    SKU: J39QHT23ZX

    Works great, easy to install, Just need to get the old one back to Best Buy to dispose of it....Works great nice refresh on the line definitely the best power supply I own....Best power supply I own

    Product Description

    A fully modular black power supply offering low-noise operation, 80 PLUS Gold efficiency, and ATX 3.1 compatibility.
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    Your price for this item is $89.99
    Save $25
    The previous price was $114.99
  7. Thermaltake - Toughpower SFX 850W 80Plus Platinum ATX 3.1 Standard Power Supply - Black

    SKU: J39ZPC9VTH

    Product Description

    A fully modular black power supply featuring 80 PLUS Platinum efficiency and ATX 3.1 compatibility.
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    Your price for this item is $175.17
    Save $4
    The previous price was $179.99
  8. Logitech - SWYTCH Hub Power Supply (Spare Part) 952-000023 - Black

    SKU: J7H7ZY3PHL

    Product Description

    A black AC adapter compatible with 120 V and 230 V AC input for reliable laptop charging.
    See all Laptop Chargers & Adapters
    Your price for this item is $63.15

FAQ

Small computer power supplies often come with a variety of connectors, such as 24-pin ATX, 4+4 pin CPU, SATA power, PCIe, and Molex connectors, to ensure compatibility with different components inside your computer.

Some small power supplies are designed specifically for SFX or TFX form factors, but many include adapters or mounting brackets to fit into standard ATX cases. Always check the product specifications for compatibility with your case.

Yes, many compact power supplies offer modular or semi-modular cabling, allowing you to connect only the cables you need, which helps with cable management and airflow inside smaller cases.

Many small power supplies are designed to provide enough wattage and the necessary PCIe connectors to support modern graphics cards. Be sure to verify the wattage and connector requirements of your specific GPU before purchasing.

Look for certifications like 80 PLUS (Bronze, Silver, Gold, or Platinum) to ensure energy efficiency and reliable performance. These certifications indicate that the power supply meets industry standards for efficiency and quality.