Power Supply Unit Silverstone ST45SF 450 W

The Silverstone ST45SF is a compact SFX power supply unit delivering 450 W of continuous power. Designed for small form factor systems, it includes an ATX adapter bracket for compatibility with smaller ATX cases. The unit is 80 PLUS Bronze certified and supports wide AC input (90–264 V). It is available in versions rated for continuous 24/7 operation at 50°C (V2.0) or at 40°C with improved noise and +12V output (V3.0).

Advantages

The ST45SF combines SFX compactness with features typically found in larger PSUs: stable single +12V rail with up to 36 A, Active PFC, and 80 PLUS Bronze efficiency (approximately 82–85% across typical loads). It provides dedicated PCI-E connectors (one 8‑pin and two 6‑pin) for discrete GPU support and comes with a temperature‑controlled silent fan (80 mm for V2.0, 92 mm for V3.0) to balance cooling and acoustics. The included ATX bracket increases installation flexibility.

Suitable for

• Small form factor desktops and mini-ITX builds that require an SFX power supply
• Compact ATX cases using an SFX-to-ATX adapter bracket
• Home office PCs and gaming desktops needing a reliable 450 W PSU

Key specifications

• Total power: 450 W
• 80 PLUS certification: Bronze (approx. 82–85% efficiency at 20–100% load)
• Motherboard connector: 20+4 pin ATX
• +12V: single rail, up to 36 A
• Fan: temperature‑controlled (80 mm on V2.0, 92 mm on V3.0)
• AC input voltage: 90–264 V
• Connectors: single PCI‑E 8‑pin and two PCI‑E 6‑pin
• Dimensions: 125 mm × 100 mm × 63.5 mm

How to use

Install the ST45SF into an SFX-compatible chassis or fit it into a smaller ATX case using the included adapter bracket. Connect the 20+4 pin ATX cable to the motherboard and attach required peripheral cables (SATA, PCI‑E, etc.) to the components. Ensure proper airflow within the case so the temperature‑controlled fan can operate effectively. Use the unit within the specified ambient temperature rating for the chosen version (V2.0: 50°C; V3.0: 40°C) for continuous 24/7 operation.

Recommendations

Choose V3.0 for lower noise and higher +12V output when building a home desktop or gaming PC; select V2.0 if 50°C operating tolerance is required. Verify connector compatibility and total system power draw to ensure the 450 W capacity meets your build requirements.