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Silverstone
Silverstone Strider Platinum PS-ST55F-PT 550 W power supply
A 550 W fully modular ATX power supply with 80 PLUS Platinum efficiency, a 140 mm depth and a semi-fanless 120 mm fan
- TypeATX12V / EPS12V
- Maximum Power550 W
- PFCActive
- Main Connector20+4Pin
- +12V RailsSingle
- PCI-Express Connector2 x 6+2-Pin
- 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.
Highlights
- 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
Specifications
| Brand | SilverStone |
|---|---|
| Series | Strider Platinum series |
| Model | PS-ST55F-PT |
| Type | ATX12V / EPS12V |
| Maximum Power | 550 W |
| PFC | Active |
| Main Connector | 20+4Pin |
| +12V Rails | Single |
| PCI-Express Connector | 2 x 6+2-Pin |
| SATA Power Connector | 8 |
| Modular | Full Modular |
| Efficiency | 89%~92% at 20%~100% loading |
| Energy-Efficient | 80 PLUS PLATINUM Certified |
| Over Voltage Protection | Yes |
| Input Voltage | 90 - 264 V |
| Input Frequency Range | 47 - 63 Hz |
| Output | +3.3V@20A, +5V@20A, [email protected] , [email protected] , [email protected] |
| MTBF | >100,000 Hours |
| Connectors | 1 x 24 / 20-Pin motherboard connector(550mm) 1 x 8 / 4-Pin EPS / ATX 12V connector(750mm) 2 x 8 / 6-Pin PCIE connector("550mm"x2) 8 x SATA connector("600mm / 150mm / 150mm /150mm"x2) 6 x 4-Pin Peripheral connector("600mm / 150mm / 150mm"x2) 2 x 4-Pin Floppy connector("600mm / 150mm / 150mm / 150mm"x2) |
| Features | Compact design with a depth of 140mm for easy integration High efficiency with 80 PLUS Platinum certification 100% modular cables 24/7 continuous power output with 40? operating temperature Class-leading single +12V rail Strict ±3% voltage regulation and low ripple & noise Ultra silent 120mm fan with intelligent semi-fanless operation |
| Dimensions | 3.39" x 5.91" x 5.51" |
| Weight | 4.74 lbs. |
| Shipping weight | 2.67 kg |
| Package size | 295 × 231 × 102 mm |
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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