Top 10 Best 400 Watt PSU Reviews in 2024: Comprehensive Guide

The Thermaltake Smart 400 Watt PSU is an excellent choice for users seeking a reliable and efficient power supply for their PC builds. Its 80+ White certification guarantees high-energy efficiency, reducing power consumption and saving on energy bills. The 120mm ultra-quiet cooling fan ensures effective heat dissipation while minimizing noise levels, providing a quiet and comfortable computing experience.

The ATX 12V V2.3/EPS 12V compatibility makes this PSU compatible with a wide range of motherboards, ensuring easy integration into various system configurations. Its continuous power delivery ensures stable operation, even under demanding loads, making it suitable for everyday computing and light gaming. Additionally, its compact size allows for easy installation in most PC cases.

The EVGA 400 N1 is an excellent choice for budget-minded PC builders who need a reliable and affordable power supply. With its 400 watts of power, 80+ White certification, and compact design, the 400 N1 is perfect for entry-level and mid-range gaming PCs. It is also a good choice for users who are looking to upgrade their power supply without breaking the bank.

One of the best things about the EVGA 400 N1 is its price. At under $50, it is one of the most affordable 400-watt power supplies on the market. Despite its low price, the 400 N1 is still a well-made product. It is built with high-quality components and has a sturdy construction. The 400 N1 also comes with a 2-year warranty, which is shorter than some competing models but still provides peace of mind.

APEIVA's VENUS 450W power supply offers an exceptional blend of power, reliability, and thermal efficiency. With a generous 450W output, it effortlessly powers mid-range gaming rigs and handles everyday computing tasks. The standout feature of this PSU is its auto-thermally controlled 120mm fan. This intelligent fan automatically adjusts its speed based on the power supply's temperature, maintaining optimal cooling while minimizing noise. This PSU impresses with its robust protection suite. Overvoltage (OVP), Undervoltage (UVP), Overcurrent (OCP), Overpower (OPP), and Short Circuit (SCP) protections guard your valuable components from electrical hazards.

While it lacks the modular cable design preferred by some enthusiasts, the VENUS 450W's non-modular cables are of decent quality. Additionally, the number of SATA power connectors may be limiting for systems with multiple storage drives. Despite these minor drawbacks, APEIVA's VENUS 450W ATX Power Supply remains an excellent choice for budget-conscious builders or those seeking a dependable and efficient PSU for their mid-range gaming or everyday computing needs.

For those seeking a dependable and affordable power supply for their PC, the AGV Power Supply emerges as a solid choice. Boasting an 80 Plus Bronze certification, this 400W PSU ensures consistent and efficient power delivery, reducing energy consumption and promoting system stability.

Backed by a reassuring 5-year warranty, the AGV Power Supply offers long-lasting peace of mind, guaranteeing its durability under normal usage conditions. Its non-modular design simplifies installation, making it a breeze to set up, especially for first-time builders. However, it's worth noting that the 400W wattage limit may restrict future component upgrades or support for power-hungry components. Additionally, the non-modular cables may contribute to some clutter within the PC case, so cable management may require extra attention.

The Apevia SPIRIT600W ATX Power Supply is an exceptional choice for budget-conscious builders and casual users alike. Its impressive 400W output capacity and auto-thermally controlled 120mm fan provide a solid foundation for a wide range of computing applications. The power supply features comprehensive protection mechanisms, ensuring the safety and stability of your system. While its non-modular design and limited PCIe power connectors might not be ideal for power-hungry gaming setups, the Apevia SPIRIT600W remains an excellent option for most users.

The auto-thermally controlled fan is a standout feature of this power supply. It automatically adjusts its speed based on the system's temperature, ensuring optimal cooling without excessive noise. This feature is particularly beneficial for users who demand a quiet computing experience. Additionally, the power supply's compact design makes it easy to fit into smaller cases, further enhancing its versatility.

The APEVIA SFX-AP400W is an ideal power supply unit for compact system builds, offering a reliable and efficient power source in a small and convenient SFX form factor. With 400 watts of continuous power output, it can provide ample power for mid-range gaming or general-purpose systems. Its compact size makes it suitable for mini-ITX or micro-ATX motherboards, minimizing space constraints in small form factor builds.

Its high-quality components and strict voltage regulation ensure stable power delivery, reducing potential system instability and component damage. The modular cable design allows for easy cable management, improving airflow and minimizing clutter within the PC case. However, it's important to note that the 400-watt capacity of this unit may not be sufficient for high-powered systems with multiple graphics cards or other demanding components.

The Apevia ITX-PFC400W is a versatile and efficient 400 watt PSU tailored for small form factor builds. Its fully modular design allows for customized cable management, minimizing clutter and maximizing airflow within the compact dimensions of Mini ITX or Flex ATX cases. The active PFC ensures stable power delivery, ensuring reliable operation even under fluctuating voltage conditions.

Apevia's 400 watt PSU packs a punch with its high-quality components, ensuring long-term performance and reliability. It operates quietly, creating a distraction-free computing environment for gaming or work sessions. While it may be slightly more expensive than some competitors within its wattage range, the Apevia ITX-PFC400W offers exceptional value for its combination of power efficiency, modularity, and compact design, making it a top choice for small form factor enthusiasts.

The EVGA 400 Watt PSU 100n10400l1 is an ideal choice for budget-conscious builders seeking a reliable and efficient power supply. With its 400 watts of continuous power, it can handle most entry-level and mid-range gaming systems without breaking a sweat. The compact design makes it suitable for smaller cases, and the included cables are long enough to reach all essential components.

The 400-watt power supply from EVGA is not only budget-friendly but also boasts impressive performance. It delivers clean and stable power, ensuring smooth operation of your system. Moreover, it features multiple protection mechanisms to safeguard your valuable components from electrical hazards. The 100n10400l1 comes with a three-year warranty, providing peace of mind and long-term reliability. Overall, the EVGA 400 Watt PSU is an excellent choice for those looking for a reliable and affordable power supply for their next PC build.

The S-Union Upgraded 400W Power Supply is an excellent choice for users seeking a reliable and compatible power supply for their HP desktops. Its wide compatibility with various models ensures seamless integration and operation. The 400-watt power output provides sufficient power for everyday computing needs and supports modest graphics cards. Its compact form factor allows for easy installation in most desktop cases, making it a practical solution for space-constrained environments.

The power supply adheres to industry standards, ensuring safety and performance. It features built-in protections against overvoltage, short circuits, and overloads, safeguarding your system from potential damage. While it may not be ideal for high-power gaming setups, the S-Union 400W Power Supply is a reliable choice for general-purpose computing, office use, and budget-conscious users seeking a stable and efficient power solution for their HP desktops.

The MSI MAG A550BN Gaming Power Supply is a solid choice for budget-conscious gamers looking to power their entry-level gaming systems. Its compact size makes it easy to install even in smaller cases, and its 80 Plus Bronze certification ensures reliable performance. While its 550W wattage may not be suitable for high-end graphics cards, it should be sufficient for most mainstream systems. Overall, the MSI MAG A550BN is a dependable power supply that won't break the bank.

One of the key advantages of the MSI MAG A550BN is its compact size. Measuring just 140mm in length, it can easily fit into smaller cases where space is limited. This makes it an excellent option for mini-ITX or micro-ATX builds. Additionally, the fully modular design allows for easy cable management, reducing clutter and improving airflow within the case.