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Item#: N82E16817256164

SILVERSTONE SFX Series SST-SX550 500W SFX 80 PLUS GOLD Certified Active PFC Power Supplies

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  • SFX
  • 80 PLUS GOLD Certified
  • 90 - 264 V 47 - 63 Hz
  • +3.3V@21A, +5V@22A, +12V@45A, +5VSB@2.5A, -12V@0.3A

  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

SFX Series SX550

  • Supports standard SFX form factor
  • 550W continuous power output at 50? operating temperature rated for 24/7 operation
  • High efficiency with 80 PLUS Gold certification
  • Class-leading single +12V rail with 45A
  • Silent running 80mm fan with 18dBA minimum
  • Support dual PCI-E 8/6 pin connectors
  • Active PFC

As the standards bearer of SFX PSUs, SilverStone’s continuous breakthrough in power supply miniaturization and power density has resulted in SX550, a standard sized SFX model with high performance but surprisingly affordable price. It has 80 PLUS Gold level of efficiency, 50? temperature rating, and reliability of a continuous 550W output for 24/7 operation. Furthermore, the SX550 has a flexible single +12V rail with 45A to support dual 8pin/6pin PCI-E connectors for multi-GPU systems. Equipped with automatic temperature control, its 80mm fan can remain silent during idle and provide adequate cooling during high loading conditions. For SFF enthusiasts looking for the best bang for their bucks, the SX550 is an excellent choice.


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


Built-in 80mm fan has excellent airflow and low noise, perfect for quiet home or office use.


1 x 24 / 20-Pin motherboard connector


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


2 x 8 / 6-Pin PCIE connector


3 x SATA connector


2 x 4-Pin Peripheral connector


1 x 4-Pin Floppy connector

Model No. SST-SX550
Max. DC Output 550W
Power density 693W per liter
Load Range
  +3.3V +5V +12V +5VSB -12V
Max.(Amps) 21A 22A 45A 2.5A 0.3A
Peak (Amps) / / / 3A /
Min.(Amps) 0A 0A 0.1A 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 120W
combined +12V 540W
Input Voltage 90V ~ 264V
Input Frequency Range 47Hz ~ 63Hz
PFC Active PFC(PF>0.9 at Full Load)
Efficiency 87% ~ 90% at 10% ~ 100% loading
MTBF 100,000 hours
Operating temperature 0°C ~ 50°C
Protection Over Current Protection
Over Power Protection
Over Voltage Protection
Short Circuit Protection
Over Temperature Protection
Connectors 1 x 24 / 20-Pin motherboard connector(300mm)
1 x 8 / 4-Pin EPS / ATX 12V connector(400mm)
2 x 8 / 6-Pin PCIE connector("400mm / 150mm" x 2)
3 x SATA connector(300mm / 200mm / 100mm)
2 x 4-Pin Peripheral connector(300mm / 200mm)
1 x 4-Pin Floppy connector(300mm / 200mm / 200mm)
Cooling System Single 80mm silent fan
Noise Level 18 dBA minimum
Dimension 125 mm (W) × 63.5 mm (H) × 100 mm (D)
Weight 1.1 kg
Form factor SFX
Certification 80 PLUS Gold
Other Compatible with ATX12V v2.4

Learn more about the Silverstone SST-SX550

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 3 years
  • Limited Warranty period (labor): 3 years
  • Read full details
  • Return Policies
    • Return for refund within: 30 days
    • Return for replacement within: 30 days
  • This item is covered by's Standard Return Policy.
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