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400w Power Supply

The power supply is a crucial component of any computer. It's the part that converts AC current from the wall outlet into DC current that your computer's components can use. It also has to be able to handle the load from all of those components, especially if you're overclocking, which means you'll want a power supply with a high-quality fan and top-notch electrical components. We're confident our top picks are the best you can buy for your own system.

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  1. Cobra - PURE SINE 400 Watt Power Inverter with Fast Charge USB - Black

    SKU: J7XH3ZFX5Q

    Product Description

    A black power inverter delivering 400 watts of pure sine wave power with fast-charge USB for sensitive electronics.
    See all Automotive Power Inverters
    Your price for this item is $130.00
  2. Rosewill - micro atx mini tower pc case with pre-installed 400w power supply | lef - Black

    SKU: J39K6Y5ZXS

    Product Description

    A black steel and tempered-glass PC case with pre-installed 400W power supply and USB 3.0 connectivity.
    See all Computer Cases
    Your price for this item is $69.99
  3. Boss - Elite BE400.1D 400W RMS Mono Class D Amplifier with Remote Subwoofer Level Control and LED Illuminated End Panels - Black/Gray

    SKU: J3XHF9XRF3

    Product Description

    A powerful black and gray Class D mono amplifier with remote subwoofer control, bass boost, and LED panels.
    See all Car Mono Subwoofer Amplifiers
    Your price for this item is $189.99
  4. Rosewill - micro atx mini pc computer case with pre-installed 400w power supply | - Black

    SKU: J39K6Y5ZXX

    Product Description

    A black steel-and-tempered-glass micro ATX case with a pre-installed 400W power supply and USB 3.0 ports.
    See all Computer Cases
    Your price for this item is $79.99
  5. Sonance - 8-50 AMP - 400W 8.0 Ch. Multi-Channel Amplifier for Home Audio & Multi Room Systems (Each) - Black

    SKU: J78WL7S4TT

    Product Description

    A black multi-channel amplifier delivering 400W of high-fidelity sound for seamless whole-home audio integration.
    See all Power Amplifiers
    Your price for this item is $1,485.00
  6. Thermaltake - Smart W3 500W 80Plus Certified ATX v3.1 Spec Power Supply - Black

    SKU: J39ZPC6J2R

    Product Description

    A reliable black ATX 500W non-modular power supply with 80 PLUS efficiency and PCIe 4.0 support.
    See all Power Supplies
    Your price for this item is $49.99

FAQ

A 400W power supply is suitable for entry-level to mid-range desktop computers, small form-factor PCs, and basic workstations. It can support components like integrated graphics or low-power dedicated GPUs, as well as standard hard drives and SSDs.

Many 400W power supplies come in both modular and non-modular options. Modular power supplies allow you to connect only the cables you need, helping with cable management and airflow inside your PC case.

Yes, most 400W power supplies include the latest ATX connectors, such as 24-pin main power and 8-pin CPU power connectors, making them compatible with current-generation motherboards.

A 400W power supply is an excellent choice for a home theater PC, as these systems typically require less power and benefit from the efficiency and quiet operation of lower-wattage PSUs.

Look for certifications like 80 PLUS Bronze, Silver, or Gold, which indicate higher energy efficiency and reliable performance. These certifications ensure that the power supply meets specific efficiency standards under typical loads.