Power Supply Unit Silverstone ST40F-ES230 400 W

The Silverstone ST40F-ES230 is a 400 W power supply unit designed for desktop PCs that require reliable, continuous power. It offers 80 PLUS efficiency (up to 85% at 230 V), a single powerful +12V rail and a 120 mm cooling fan in a compact black housing. The unit uses a standard 20-pin ATX motherboard connector and non-modular cabling, supports an AC input range of 180–264 V and a frequency range of 47–63 Hz, and is built to operate continuously at elevated ambient temperatures.

Advantages

The ST40F-ES230 combines established design and quality components to support 24/7 operation at temperatures up to 40 °C while maintaining stable output and low acoustic noise. Its 80 PLUS certification ensures efficient power delivery, and the single +12V rail with standard 8-pin/6-pin PCI‑E connectors allows it to power a wide range of systems, including those with dedicated graphics cards. The compact footprint and RoHS compliance make it suitable for standard desktop builds.

Suitable for

• Home and office desktop PCs
• Budget gaming builds with mid-range graphics cards
• Systems requiring continuous 24/7 operation
• Small-form-factor cases compatible with a 20-pin ATX connector

Key specifications

• Total power: 400 W
• Efficiency: up to 85% (80 PLUS)
• Motherboard connector: 20-pin ATX
• Fan: 120 mm
• AC input voltage: 180–264 V
• Frequency range: 47–63 Hz
• Weight: 1.26 kg
• Colour: Black

How to use

Install the power supply into a compatible desktop chassis following the motherboard and case manufacturer guidelines. Connect the 20-pin ATX main power connector to the motherboard and attach the available PCI‑E connectors to compatible graphics cards as required. Ensure the PSU is connected to an appropriate AC source within the 180–264 V range. Allow adequate airflow around the 120 mm fan and maintain ambient temperature below 40 °C for continuous operation.

Recommendations

For reliable, long-term operation, use the ST40F-ES230 in systems whose total component power draw remains comfortably below the 400 W rating, ensure good case ventilation, and avoid exposing the unit to temperatures above 40 °C. Regularly check connections and dust buildup on the fan to maintain efficiency and low noise levels.