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Silver rectangular ATX power supply unit with modular cable sockets and 120mm fan grille

Silverstone

Silverstone Strider Platinum PS-ST55F-PT 550 W power supply

SKU CH-WHJX-21Y2Q MPN PS-ST55F-PT

A 550 W fully modular ATX power supply with 80 PLUS Platinum efficiency, a 140 mm depth and a semi-fanless 120 mm fan

  • Max wattage550 W
  • Power efficiency89%~92% at 20%~100% loading
  • Modular cablingFull Modular
  • Power factor correctionActive
  • Main power connector20+4Pin
  • 12V railsSingle
  • Compact 140mm depth fits small cases easily
  • 80 PLUS Platinum certification delivers 89% to 92% efficiency
  • Fully modular cables simplify builds and improve airflow
  • Single +12V rail provides stable power for demanding components
  • Semi-fanless operation stays silent below 20% load

Compact 140 mm ATX power supply

The SilverStone Strider Platinum PS-ST55F-PT is a fully modular 550 W unit built to the ATX12V and EPS12V standard. Its 140 mm depth helps it fit into smaller cases while still delivering 80 PLUS Platinum efficiency between 89% and 92% across 20% to 100% load. A single +12V rail provides all 12 V power for simpler cable routing.

Check case depth and connector needs

Verify that your chassis can accommodate a 140 mm deep power supply and that the 20+4 pin motherboard, 8/4 pin EPS, two 6+2 pin PCIe and eight SATA connectors match your component list. The unit accepts 90 to 264 V input at 47 to 63 Hz, so confirm your local mains voltage falls in that range. Ensure the 550 W maximum output covers the total draw of your planned hardware.

Suits efficient small-form-factor builds

This supply suits builders who want Platinum-grade efficiency and fully modular cabling in a compact ATX footprint, especially where semi-fanless operation below 20% load is valued. It is not for systems whose peak demand exceeds 550 W, nor for builds that require more than two PCIe power cables or more than eight SATA power connections.

How it compares

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

Price $95.99
Cheaper than about 69% of the 10,869 comparable items (median $142.99).
Max wattage 550 W
Lower than about 82% of the 930 comparable items (median 850 W).

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Specifications

Product
Brand nameSilverStone
Product lineStrider Platinum series
Model namePS-ST55F-PT
Product typeATX12 V / EPS12 V
Ports & slots
PCIe power connectors2 × 6+2-Pin
SATA power connectors8
Output type+3.3 V@20A, +5 V@20A
Connection types1 × 24 / 20-Pin motherboard connector(550 mm)
1 × 8 / 4-Pin EPS / ATX 12 V connector(750 mm)
2 × 8 / 6-Pin PCIE connector("550 mm"x2)
8 x SATA connector("600 mm / 150 mm / 150 mm /150 mm"x2)
6 × 4-Pin Peripheral connector("600 mm / 150 mm / 150 mm"x2)
2 × 4-Pin Floppy connector("600 mm / 150 mm / 150 mm / 150 mm"x2)
Power
Max wattage550 W
Power efficiency89%~92% at 20%~100% loading
Modular cablingFull Modular
Power factor correctionActive
Main power connector20+4Pin
12V railsSingle
Efficiency certification80 PLUS PLATINUM Certified
Overvoltage protectionYes
Supply voltage90–264 V
AC input frequency47–63 Hz
Size & build
Product dimensions3.39 in × 5.91 in × 5.51 in
Product weight4.74 lb (2.15 kg)
Shipping weight2.67 kg
Package size295 × 231 × 102 mm
More details
Mean time between failures>100,000 h

Questions about this item

What cables come in the box and what must I buy separately?

The unit includes a 24-pin ATX cable, an 8-pin EPS cable, two 6+2-pin PCIe cables, eight SATA connectors on two cables, and six peripheral connectors. All cables are detachable because the unit is fully modular, so only the supplied cables are needed.

How do I choose between the available versions or capacities?

This model is a single 550 W capacity with Platinum efficiency. There are no other wattage or efficiency variants in this specific Strider Platinum listing, so the only choice is this 550 W unit.

What does the 550 W rating mean once the unit is installed in a real system?

The 550 W figure is the maximum continuous output the single +12 V rail can deliver at up to 40 °C ambient temperature. The 80 PLUS Platinum rating means efficiency stays between 89 % and 92 % from 20 % to 100 % load, reducing waste heat.

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