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Compact silver SFX power supply unit with modular cable sockets and a single cooling fan

Silverstone

Silverstone ST45SF-G 450 W SFX power supply

SKU CH-7670-SEAFX MPN ST45SF-G

A compact 450 W SFX12V unit with full modular cabling, 80 PLUS Gold certification and a single +12 V rail rated at 37 A

  • Max wattage450 W
  • Power efficiency87%~90%(20% to 100% loading)
  • Modular cablingFull Modular
  • Fan configuration1
  • Power factor correctionActive
  • Main power connector20+4Pin
  • 450 W continuous power rated at 50 °C for 24/7 operation
  • Full modular cabling keeps small-form-factor builds tidy
  • 80 PLUS Gold certified efficiency between 87 % and 90 %
  • Single +12 V rail delivers 37 A for multi-GPU support
  • SFX12V design fits SFX cases and ATX with included bracket

450 W SFX Gold power supply

The SilverStone ST45SF-G is a fully modular SFX12V unit that delivers 450 W of continuous power. It carries 80 PLUS Gold certification and operates at 87 to 90 percent efficiency across the 20 to 100 percent load range. A single +12 V rail rated at 37 A supports modern graphics cards. The package includes an ATX mounting bracket for broader case compatibility.

Who this suits

Builders assembling compact systems that require an SFX form factor and Gold-rated efficiency will match the ST45SF-G to their needs. The single 6-pin and single 6+2-pin PCIe connectors limit multi-GPU configurations to two cards at most. Systems demanding higher wattage or additional PCIe cables should look at larger ATX or higher-capacity SFX models.

Single +12 V rail at 37 A

The +12 V rail provides 37 A, which determines whether the unit can sustain your graphics card and CPU combination under full load. Verify the total 12 V current draw of your components against this figure before purchase.

How it compares

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

Price $92.99
Cheaper than about 70% of the 10,869 comparable items (median $142.99).
Max wattage 450 W
Lower than about 86% of the 930 comparable items (median 850 W).

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Specifications

Product
Brand nameSilverStone
Model nameST45SF-G
Product typeSFX12 V
Graphics
SLI supportReady
CrossFire supportReady
Ports & slots
PCIe power connectors1 × 6-Pin, 1 × 6+2-Pin
SATA power connectors3
Output type+3.3 V@19A, +5 V@14A, +12 V@37A
Connection types1 × 24 / 20-Pin motherboard connector
1 × 8 / 4-Pin EPS / ATX 12 V connector
1 × 8/6-Pin PCIE connector
1 × 6-Pin PCIE connector
3 x SATA connector
2 × 4-Pin Peripheral connector
1 × 4-Pin Floppy connector
Power
Max wattage450 W
Power efficiency87%~90%(20% to 100% loading)
Modular cablingFull Modular
Power factor correctionActive
Main power connector20+4Pin
12V railsSingle
Efficiency certification80 PLUS GOLD Certified
Overvoltage protectionYes
Supply voltage90–264 V
AC input frequency47–63 Hz
Size & build
Product dimensions4.92 in × 2.5 in × 3.94 in
Product weight3.2 lb (1.45 kg)
Shipping weight1.58 kg
Package size231 × 175 × 79 mm
Compatibility
Haswell compatibilityYes
More details
Fan configuration1
Mean time between failures100,000 h at 25 Degrees C, full load

Questions about this item

Does the SFX12V form factor fit in an ATX case using the included adapter bracket?

The SFX12V unit ships with an adapter bracket so it can mount in standard ATX chassis as well as native SFX cases.

Which cables must be attached first when installing this fully modular 450 W supply?

Connect the 20+4Pin main power, the 6-Pin and 6+2-Pin PCI-Express leads, and the three SATA power cables before routing them through the case.

How often should the single 80 mm fan be cleaned to maintain 24/7 operation at 50 °C?

Remove dust from the fan intake every 6 to 12 months to preserve airflow and the 80 PLUS Gold efficiency rating.

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