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SilverStone Strider Platinum series PS-ST55F-PT 550W ATX12V / EPS12V 80 PLUS PLATINUM Certified Full Modular Active PFC Power Supply

Ships from United States.

Sold and Shipped by VirVentures a-seller

Purchases from these Sellers are generally covered under our Newegg Marketplace Guarantee.
Marketplace Seller
  • ATX12V / EPS12V
  • Full Modular
  • 80 PLUS PLATINUM Certified
  • 90 - 264 V 47 - 63 Hz
  • +3.3V@20A, +5V@20A, +12V@45.9A, +5VSB@3.0A, -12V@0.3A

  • Overview
  • Specs
  • Warranty & Returns
  • Reviews

Strider Platinum series ST55F-PT

  • 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

As desktop computers continue to advance toward ever more efficient and smaller designs, SilverStone is helping to drive the efficiency movement by releasing the Strider Platinum series of power supplies. Created to be the smallest fully modular ATX power supplies with 80 PLUS Platinum efficiency, they are also incredibly quiet with the ability to run in fanless mode. If the loading condition is below 20%, the fan in the power supply can remain off for silent operation during idle or low powered computing activities. Other great features inherited from previous Strider series include ±3% regulation, powerful single +12V rail, 24/7 continuous power output, and multiple PCI-E cables. For those looking to build highly efficient systems in small footprints, the Strider Platinum is definitely the best choice.


Designed for 80 PLUS Platinum level of efficiency to reduce wasted heat and save on electricity.


100% modular cable design for use with short cable kit such as SilverStone’s PP05 or for easy removal in a case with cable routed and tied down.


Flat cables have much greater flexibility to allow for tighter folding and management of cables.


140mm depth sets new standard for high wattage PSUs with modular cables.


Powerful single +12V rail design, perfect for future high-end component upgrades or overclocking.


±3% regulation and low ripple & noise performance for high stability


Built-in 120mm fan has excellent airflow and low noise, perfect for quiet home or office use.


100% modular PSU


Single 120mm silent fan


1 x 24 / 20-Pin motherboard connector


1 x 8 / 4-Pin EPS / ATX 12V connector


2 x 8 / 6-Pin PCIE connector


8 x SATA connector


6 x 4-Pin Peripheral connector


2 x 4-Pin Floppy connector

Model No. SST-ST55F-PT
Max. DC Output 550W
Power density 305W per liter
Load Range
  +3.3V +5V +12V +5VSB -12V
Max.(Amps) 20A 20A 45.9A 3.0A 0.3A
Peak (Amps) / / / / /
Min.(Amps) 0A 0A 0A 0A 0A
Range (%) ±3% ±3% ±3% ±5% ±10%
Line Reg.(%) ±1% ±1% ±1% ±1% ±1%
Ripple(mVp-p) 50mV 50mV 120mV 50mV 120mV
Color Black(Lead-Free Paint)
combined +3.3, +5V 105W
combined +12V 550W
Input Voltage 90V~264V
Input Frequency Range 47Hz~63Hz
PFC Active PFC(PF>0.9 at full load)
Efficiency 89%~92% at 20%~100% loading
MTBF 100,000 hours
Operating temperature 0°C ~ 40°C
Protection Over current protection
Over power protection
Over voltage protection
Under voltage protection
Over temperature protection
Short circuit protection
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 / 150mm"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)
Cooling System Single 120mm silent fan
Noise Level 0 ~ 28 dBA
Dimension 150 mm (W) x 86 mm (H) x 140 mm (D)
Weight 2.15 kg
Form factor ATX
Certification 80 PLUS Platinum
Other GPU Support list
Compatible with ATX12V v2.4

Learn more about the Silverstone PS-ST55F-PT

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year
  • Read full details
Ownership: 1 week to 1 month
Verified Owner
5/ 5
Good modular option for small cases 6/6/2017 7:49:02 PM

Pros: Used in a Lian Li PC-Q25B, it was a tight fit, but anything larger would have been impossible. The modular cabling also helped a lot with the space. No problems with function for at least a week.

Cons: I mean, it could've been smaller? That's asking for a bit much, though.

Did you find this review helpful?
Ownership: 1 month to 1 year
Verified Owner
5/ 5
Works great! 12/10/2016 7:25:13 PM

Pros: Fully modular and low-power consumption!

Cons: The price is worth the performance and quality!

Did you find this review helpful?
Ownership: 1 day to 1 week
Verified Owner
1/ 5
Garbage 8/4/2016 4:36:50 PM

Pros: It measures only 140mm long, so if you want to cram a 3.5mm hard drive into a Silverstone SG13 Mini-ITX case, it will all fit with this unit.

Cons: I bought two of these, one from Newegg and one from a certain other retailer named after the second longest river on earth. My PC wouldn't power on with either one. Until I plugged my trusty Seasonic back in, and then everything worked just fine. Silverstone's quality control must be awful if I somehow ended up with two defective units from two different retailers.

1 out of 4 people found this review helpful. Did you?
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