Finding a reliable 400 watt power supply can be critical for compact builds, workstation upgrades, and budget-conscious setups. This guide reviews five dependable 400W options across mainstream brands, highlighting compatibility, protections, and key specs. Each product is suitable for small form factor desktops, LEDs, or DIY projects requiring steady 12V output. Use the buying guide below to compare features and decide which model best fits your needs.
| Product | Brand | Output | Focus |
|---|---|---|---|
| BestParts New 400W PSU | BestParts | 400W | HP Pro/ Pavilion compatibility |
| inShareplus 24V 400W LED Driver | inShareplus | 24V DC, 400W | Outdoor/industrial LEDs |
| S-Union 400W PSU | S-Union | 400W | HP ProDesk/ G3 compatibility |
| LXun 400W 942332-001 PSU | LXun | 400W | HP ProDesk G3/G4 repair |
| REXTiN 400W LED Driver | REXTiN | 400W | 12V LED/strip applications |
BestParts New 400W Power Supply
The BestParts 400W PSU is designed for HP Pavilion and ProDesk systems. It features a 400W maximum output, with a connector set that includes multiple 4-pin, 7-pin, and 8-pin configurations to match HP models such as Pavilion 590/690 and Envy TE01. This unit emphasizes compatibility and stable power delivery for mid-range business desktops. The protections and efficiency specifications align with standard desktop usage, making it a practical upgrade or replacement option for compatible HP towers.
inShareplus 24V 400W LED Power Supply
This 24V, 400W output LED driver is built for harsh environments with an IP67-rated aluminum shell for heat dissipation and rugged outdoor use. It converts 90-140V AC to 24V DC, delivering 16.6A. Suitable for LED strips, outdoor lighting, and other 24V DC projects, the unit emphasizes reliability in moisture-prone settings and safety with protective features to manage surges and overloads.
S-Union 942332-001 400W PSU
The S-Union 942332-001 is a 400W power supply designed to fit HP ProDesk 480/680/285/288/280 G3 MT models and other PA-3401-1HA/2HA compatible units. It provides matched voltage rails, including +12V main and CPU rails, with specified current capacities to support mid-range business desktops. This option focuses on HP ecosystem compatibility and a straightforward replacement path for affected systems.
LXun 400W 942332-001 PSU
The LXun 400W PSU covers HP ProDesk and similar G3/G4 configurations with 942332-001 and L04618-400 part numbers. It supports 100-240V input and includes 4Pin+4Pin+8Pin+7Pin connectors to meet HP motherboard and chassis layouts. It is presented as a repair or upgrade solution for older HP business desktops, emphasizing compatibility and stable 12V rails for upgraded components.
REXTiN Switching Power Supply 400W
The REXTiN 12V 400W LED driver uses a switching topology designed for LED strip lights and related devices requiring steady 12V output. It provides input compatibility with 110V/220V AC and protections for short circuits, overloads, overvoltage, and temperature, enhancing reliability in lighting installations and small electronics projects. Efficiency and safety protections are highlighted for continuous operation in controlled environments.
Buying Guide: How To Choose A 400W Power Supply
- Compatibility: Check connector types and pin counts to match your motherboard and devices. Some HP systems require specific 4-pin, 7-pin, or 8-pin configurations.
- Output stability: Look for models with solid +12V rails and adequate amperage for CPU and GPU combinations, especially if upgrading from lower wattage units.
- Protection features: Essential protections include short-circuit, overcurrent, overvoltage, overtemperature, and surge protection to safeguard components.
- Efficiency and cooling: 80 Plus ratings indicate efficiency; consider active cooling and noise levels for quiet builds or compact enclosures.
- Environmental suitability: If the application is outdoor or industrial (LED drivers, CCTV), IP ratings and rugged housings improve reliability.
- Form factor and mounting: Ensure the PSU fits your case and mounting orientation. Some 400W units resemble standard ATX or HP-specific form factors.
- Warranty and support: A longer warranty helps cover potential compatibility concerns or field failures after installation.
- Reliability for DIY projects: For LED and electronics projects, consider whether a dedicated LED driver or a general-purpose PSU best suits your load profile.
Across the listed models, buyers should weigh compatibility with their system, intended use (desktop upgrade vs. LED project), and environmental conditions. The selection emphasizes dependable 400W options suitable for HP desktops and various 12V LED or industrial applications, offering multiple protections and practical connector configurations.