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Rectangular silver ATX power supply, 140mm deep, modular cable sockets visible, 120mm fan grille on one side

Silverstone Technology

Silverstone Technology ST55F-GS 550W power supply

SKU CH-JNCR-3H0T9 MPN ST55F-GS

Delivers 550W continuous power with 80 PLUS Gold efficiency, fully modular cables, a single +12V rail rated at 45A, 3% voltage regulation.

  • Compact 140mm depth fits tight builds easily
  • 80 PLUS Gold efficiency reduces wasted energy
  • Fully modular cables simplify cable management
  • Single +12V rail delivers 45A for stable power
  • 120mm fan runs at 18dBA for quiet operation

Compact 140mm depth ATX PSU

The Silverstone Technology ST55F-GS is a 550W fully modular ATX power supply built for small-form-factor and standard desktop builds. Its 140mm depth allows installation in tight chassis while delivering 80 PLUS Gold certified efficiency. The single +12V rail provides 45A for stable power to modern components. This unit suits builders who value clean cable management and quiet operation.

Verify ATX clearance and connector needs

Before ordering confirm the case accepts a 140mm deep ATX power supply and that the motherboard uses standard 24-pin and CPU power connectors. The unit includes two 8/6-pin PCIe cables for graphics cards requiring up to two such connectors. Systems needing more than two PCIe power cables or proprietary motherboard connectors are not a fit.

40°C continuous output with low noise

Rated for 24/7 operation at 40°C ambient temperature the PSU maintains its full 550W output without derating. The 120mm fan runs at a minimum of 18dBA for quiet performance under sustained load. Voltage regulation stays within 3% with low ripple and noise across the single +12V rail. This design prioritises consistent delivery over short burst capability.

How it compares

Measured against everything we stock in ATX Desktop Power Supplies, at today’s prices. Recalculated every night.

Price $61.99
Cheaper than about 84% of the 10,869 comparable items (median $142.99).

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Specifications

Size & build
Shipping weight2.27 kg
Package size25 × 25 × 25 mm

Questions about this item

What cables are included with the ST55F-GS and do I need to buy any separately?

The power supply is 100% modular; the box contains the standard set of ATX, CPU and PCIe cables plus peripheral cables, so a typical build needs no extra purchases.

Which capacity from the Strider Gold S range should I choose for a mid-range gaming PC?

This model delivers 550W, while the series spans 550W to 1500W; 550W suits mainstream builds, higher wattages are for multi-GPU or extreme overclocking setups.

What does the 45A single +12V rail mean for my graphics card?

The single rail can supply up to 45A on the +12V line, providing stable power for high-end GPUs through the two included 8/6-pin PCIe connectors.

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