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Silver SFX power supply unit with bracket

Silverstone Technology

Silverstone Technology 450W SFX 80 PLUS Bronze PSU ST45SF

SKU CH-4P7J-G45TR

A 450 W SFX power supply with 80 PLUS Bronze efficiency, a single +12 V 36 A rail, and 8-pin plus dual 6-pin PCIe connectors for multi-GPU builds

  • Chassis TypeDesktop
  • 450 W continuous output rated for 24/7 operation at 50 °C
  • 80 PLUS Bronze efficiency reaching 82–85 % from 20 % to 100 % load
  • Single +12 V rail delivers 36 A for stable GPU power
  • 80 mm fan runs quietly with temperature-controlled speed
  • SFX form factor fits SFX and ATX cases with included bracket

SFX form factor with ATX bracket

The ST45SF is a 450W power supply built to the SFX standard and ships with an adapter bracket so it also fits smaller ATX cases. It targets builders who need full ATX-grade features in a compact footprint for space-constrained desktops or server chassis. Buyers who require a larger PSU physical size without an adapter will need a different unit.

450W continuous output and single +12V rail

Rated for 450W continuous power at 50°C, the unit delivers a class-leading single +12V rail at 36A with active PFC. 80 PLUS Bronze certification guarantees 82% to 85% efficiency between 20% and 100% load. Systems demanding more than 450W or multiple high-wattage GPUs beyond the provided connectors will exceed this platform.

Bundled bracket and PCIe connectors

The included ATX mounting bracket lets the SFX unit install directly into standard ATX cut-outs without modification. Two PCI-E 6pin and one PCI-E 8pin connector are supplied, enabling multi-GPU configurations within the 450W budget. Builds needing additional PCIe power cables or modular cabling must source them separately.

Highlights

  • 450 W continuous output rated for 24/7 operation at 50 °C
  • 80 PLUS Bronze efficiency reaching 82–85 % from 20 % to 100 % load
  • Single +12 V rail delivers 36 A for stable GPU power
  • 80 mm fan runs quietly with temperature-controlled speed
  • SFX form factor fits SFX and ATX cases with included bracket

Specifications

Chassis TypeDesktop

Questions about this item

Will the ST45SF fit in my older ATX case that only has a standard PSU cutout?

The unit ships with an SFX-to-ATX adapter bracket so it mounts in a regular ATX opening without modification.

How can I confirm the 80 PLUS Bronze efficiency is actually being met once the PSU is installed?

The 80 PLUS Bronze rating means 82% to 85% efficiency from 20% to 100% load; you can verify this with a wall power meter while the system runs typical workloads.

Does the box include both the 8-pin and dual 6-pin PCIe cables, or do I need to buy extra connectors for a dual-GPU setup?

The package supplies one 8-pin and two 6-pin PCIe connectors, covering a two-card configuration without additional purchases.

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