Finding a reliable 350W ATX power supply is essential for compact builds, home servers, and budget desktops. This guide rounds up five well-matched 350W switching PSUs, highlighting compatibility, efficiency, and key features to help you choose without overspending. Each option suits standard Flex ATX or small-form-factor setups and supports common 24/7 or stable operation requirements.
| Product | Brand | Form Factor | Efficiency | Notable Feature |
|---|---|---|---|---|
| S-Union DPS-350AB-20A | S-Union | ATX (PSU S-Unit) | 350W rated | HP ProLiant compatibility |
| Logisys PS480D | Logisys | ATX 20/24pin | 480W peak | Detachable 4-pin section |
| Apevia Venus450W | Apevia | ATX | 450W | Auto-thermally controlled 120mm fan |
| SHARK TECHNOLOGY 400W | SHARK TECHNOLOGY | ATX | 400W | Turbo cooling airflow |
| Ptcliss 350W 1U Flex | Ptcliss | Flex ATX | 350W continuous | 6Pin PCIe + Bronze efficiency |
S-Union Upgraded DPS-350AB-20A 350W ATX Power Supply
The S-Union DPS-350AB-20A provides a compact 350W solution intended for HP ProLiant servers and other systems requiring a compatible 671310-001 or 686761-001 form factor. It emphasizes model compatibility and safe replacement, with notes to verify fit before purchasing. This PSU is a practical choice for small form factor servers or legacy server upgrades where HP compatibility matters.
Key points include a clear compatibility scope, with part numbers listed for reference, and guidance to confirm the power supply matches your device’s requirements. While not the highest efficiency option, it offers reliability in a compact footprint for specific enterprise or refurb projects.
Logisys PS480D 20/24 Pin Switching PSU
The Logisys PS480D ships with a 20/24-pin main connector and a detachable 4-pin section, making it versatile for a range of builds. It includes essential protection features like overvoltage and overpower protection to guard components during power fluctuations. This makes it a solid choice for budget-conscious builders seeking straightforward, reliable power delivery in a compact package.
With a modest 480W rating, this unit targets systems that require slightly higher headroom than a strict 350W PSU while preserving compatibility with standard ATX motherboards. It’s suitable for entry-level desktops or small workstations where cable management and simple protections are valued.
Apevia Venus450W ATX Power Supply
The Apevia Venus450W provides a robust 450W rating with a 120mm auto-thermally controlled fan, designed for quiet operation under load. It includes standard connectors: 20/24-pin main power, 8-pin (4+4) 12V, and multiple SATA and peripheral outputs. The 115/230V switch offers flexibility for global use, and a tolerance spec helps ensure stable rails across outputs, contributing to overall reliability in mid-range builds.
Compared to basic 350W units, Venus450W offers expanded headroom for additional drives or modest GPU light-duty scenarios. This makes it a prudent choice for upgradable systems that may require occasional higher loads without stepping into high-we affordability or overkill territory.
SHARK TECHNOLOGY 400W ATX 12V V2.1
The Shark Technology 400W unit targets compact desktops with a brisk cooling profile. It emphasizes reliable airflow, with a front-to-back turbo fan to push heat out of the PC case, supporting stable operation in tighter chassis configurations. The design also notes compatibility with a broad range of Intel and AMD motherboards, including newer Ryzen lineups.
While not a premium efficiency model, the 400W rating provides sufficiency for standard office builds or compact gaming rigs that stay within the wattage ceiling. The emphasis on cooling makes it attractive for systems where heat management is a primary concern in small enclosures.
Ptcliss 350W 1U Flex ATX Power Supply
The Ptcliss 350W 1U Flex ATX power supply focuses on efficiency with 80 Plus Bronze certification and full-range active PFC. It’s built to handle unstable voltages in environments where reliability is critical, such as small servers or edge devices. It includes a PCIe 6-pin connector, which adds flexibility for compact builds needing discrete PCIe power support, and a Japanese capacitor emphasis for long-term reliability.
Designed for 1U or compact chassis, the unit offers strong heat dissipation and energy saving while supporting standard flex ATX form factors. It presents a balanced option for users who require dependable performance in constrained spaces and uneven electrical conditions.
SilverStone 350W Flex ATX Power Supply
The SilverStone SST-FX350-G-USA combines a Flex ATX footprint with 80 Plus Gold efficiency and a fixed cable layout, including a PCIe 6-pin connector. It’s designed for 24/7 operation with a single high-quality +12V rail, providing solid efficiency and stable power for 350W-class builds. The Gold rating helps reduce heat and electricity usage in continuous operation environments, making it a good option for small business deployments or compact compute nodes.
Flex Power Supply 350W Fully Modular
The Flex Power Supply 350W is fully modular, designed for clean cable management and efficient builds. It supports 110-220V operation, with 350W continuous power and a 40°C rating for 24/7 operation. The modular cabling reduces clutter and improves airflow, which is especially beneficial in small form-factor racks, desktops, and server-like setups. A 6-pin PCIe connector is also included to accommodate modest discrete graphics needs or expansion cards.
Buying Guide: Key Purchase Considerations
- Form factor and compatibility: Ensure the PSU fits your chassis and matches the motherboard’s connector configuration (20/24-pin, 4/8-pin CPU, PCIe). Flex ATX options are common for compact builds.
- Wattage headroom: Choose a unit with sufficient wattage for your planned components, plus some headroom for peak loads. If you anticipate additions, lean toward units in the 350–450W range.
- Efficiency and protection: Look for 80 Plus Bronze or Gold ratings for real-world efficiency. Overvoltage, overcurrent, short-circuit, and thermal protections extend component life and reliability.
- Cooling: Consider PSU fan design and chassis airflow. Larger, automatic-controlled fans tend to deliver quieter operation in typical workloads.
- Cable management: Fully modular or semi-modular PSUs simplify cable routing, improve airflow, and reduce clutter in tight spaces.
- Reliability and cooling features: Units with robust capacitors and heat tolerance are preferable for 24/7 use or unstable power environments.
- Compatibility notes: Some models are designed specifically for certain servers or enterprise hardware; verify model numbers and replacement compatibility with your device before purchasing.
- Future needs: If you plan to upgrade GPUs or add more drives, factor in potential power needs beyond 350W to avoid pushing the PSU to its limits.