SFX     ST45SF

Supports standard SFX form factor and ATX via included bracket

■ 450W continuous power output at 50℃ temperature rated for 24/7 operation (V2.0)

■ 450W continuous power output at 40℃ temperature rated for 24/7 operation (V3.0)

■ 80 PLUS Bronze level efficiency (82%~85% efficiency at 20%~100% loading)

■ Class-leading single +12V rail with 36A

■ Silent running 80mm fan (V2.0)

■ Silent running 92mm fan (V3.0)

■ Single PCI-E 8pin and dual PCI-E 6pin connectors support

■ Active PFC

         After successfully revolutionizing both HTPC and SFF market segments with innovative chassis designs, SilverStone engineers continue their push for advancement in these categories by releasing a true upgrade-worthy small form factor power supply, the ST45SF. This SFX unit is compatible not only with chassis that use SFX power supplies but also in smaller ATX chassis with the included adapter bracket. Despite its small size, the ST45SF has features that one would expect from an elite ATX power supply such as 80 PLUS Bronze level of efficiency, temperature controlled fan, 50℃ / 40℃ temperature rating, and reliability for 24/7 operation. Enthusiasts oriented features are also present with single +12V rail and 8pin/6pin PCI-E connectors to fully support multi-GPU systems. For SFF users and for SilverStone, the ST45SF is more than just an upgrade, it is an important milestone for the DIY desktop computer.

         V2.0 has greater +3.3V and +5V output and higher temperature rating of 10℃ ~ 50℃ for NAS/storage focused systems or industrial PCs (IPC).
         V3.0 has greater +12V output and lower noise for home desktops or gaming PCs.


1.Designed for 80 PLUS Bronze level of efficiency to reduce wasted heat and save on electricity.             
2.Built-in 92mm fan has excellent airflow and low noise, perfect for quiet home or office use. (V3.0)
3.Built-in 80mm fan has excellent airflow and low noise, perfect for quiet home or office use. (V2.0) 

ST45SF (V3.0)

ST45SF (V2.0)

Model No.
Max. DC Output
Power density
567W per liter
Load Range (V3.0)
+3.3V +5V +12V +5VSB -12V
20A 20A 37.5A 3A 0.3A
Peak (Amps)
/ / / / /
0A 0A 0.3A 0A 0A
Range (%)
±5% ±5% ±5% ±5% ±10%
Line Reg.(%)
±1% ±1% ±1% ±1% ±1%
50mA 50mA 120mV 50mV 120mV
Load Range (V2.0)
 +3.3V  +5V  +12V  +5VSB  -12V
 21A  22A  36A  2.5A  0.5A
Peak (Amps)
 /  /  /  /  /
 0.1A  0.2A  0.6A  0A  0A
Range (%)
 ±5%  ±5%  ±5%  ±5%  ±10%
Line Reg.(%)
 ±1%  ±1%  ±1%  ±1%  ±1%
 70mA  70mA  140mV  70mV  140mV
Black(Lead-Free Paint)
Combined +3.3V & +5V
110W (V3.0)
120W (V2.0)
Combined +12V
450W / 37.5A (V3.0)
432W / 36A (V2.0)
Input Voltage
90 ~ 264 Vrms
Input Frequency Range
47Hz ~ 63Hz
Active PFC.(PF>0.9 at Full Load)
82%~85%(20% to 100% loading)
100,000 hours
Operating temperature
0 ~ 40℃ (V3.0)
10°C ~ 50°C (V2.0)
Over current protection
Over voltage protection
Short circuit protection
Over Power Protection (V3.0 only)
Under Voltage Protection (V3.0 only)
1 x 24 / 20-Pin motherboard connector(300mm)
1 x 8 / 4-Pin EPS / ATX 12V connector(400mm)
1 x 8/6-Pin PCIE connector(400mm)
1 x 6-Pin PCIE connector(400mm / 150mm)
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 92mm silent fan (V3.0)
Single 80mm silent fan (V2.0)
Form factor
Noise Level
18dBA minimum
125 mm (W) x 63.5 mm(H) x 100 mm(D)
4.92" (W) x 2.5" (H) x 3.94" (D)
1.1 kg (V3.0)
1 kg (V2.0)
Includes SFX to ATX bracket for use in ATX case
GPU Support list
Compatible with ATX12V v2.4
● Specifications presented on this page contains most recent revisions and may differ from those printed on retail boxes or manuals.

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ST45SF manual.
281 KB
ST45SF manual.
135 KB
ST45SF High resolution photos
8,868 KB

ST45SF eDM (st45sf-v3_edm_en.pdf)
139 KB
ST45SF eDM (EN-ST45SF.pdf)
281 KB
Multilanguage installation manual