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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 styleDesktop
  • 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.

How it compares

Measured against everything we stock in Rackmount Server Cases, at today’s prices. Recalculated every night.

Price $100.99
Cheaper than about 90% of the 1,006 comparable items (median $222.49).

New to this? Buying PC parts with Monero — what to check, what it costs to pay, and what is never asked for.

Specifications

Size & build
Chassis styleDesktop

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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