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Silver rectangular ATX power supply with 139mm fan grille and modular cable sockets

Silverstone

Silverstone SST-ST1200-PT 1200 W power supply

SKU CH-TRNN-Z4TAA MPN SST-ST1200-PT

Delivers 1200 W through a single +12 V rail with 80 PLUS Platinum efficiency and a 139 mm semi-fanless cooler

  • Max wattage1200 W
  • Power efficiency89% - 92%
  • Fan configurationSingle 139 mm silent fan
  • Power factor correctionActive
  • Main power connector20+4Pin
  • 12V railsSingle
  • 80 PLUS Platinum certification cuts energy waste with 89-92% efficiency
  • Single 139mm Air Penetrator fan runs semi-fanless for quiet operation
  • Single +12V rail delivers 100A for stable multi-GPU power
  • 16 SATA connectors plus 8 PCIe plugs support dense storage and graphics
  • 180mm depth fits standard ATX cases while supplying 1200W continuous output

1200 W Platinum power supply

The Silverstone Strider Platinum SST-ST1200-PT delivers 1200 W of continuous power for high-end desktop systems. It meets 80 PLUS Platinum efficiency with a single +12 V rail rated at 100 A. The unit accepts 105 to 264 V input at 47 to 63 Hz. A 139 mm Air Penetrator fan handles cooling.

Thermals, noise and power draw

The 139 mm fan runs semi-fanless at low load and stays within a 40 degree C operating temperature. Efficiency ranges from 89 to 92 percent across typical loads. Active PFC and over-voltage protection keep output stable. MTBF exceeds 100000 hours.

Build fit and modularity

Fully modular cables include 24, 20, 16, 12, 8 and 6 pin connectors for motherboard, CPU, PCIe and SATA devices. An FF141 magnetized fan filter is supplied. The chassis measures 180 mm deep. Strict voltage regulation stays within +/- 3 percent.

How it compares

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

Price $255.99
Pricier than about 72% of the 10,869 comparable items (median $142.99).
Max wattage 1200 W
Higher than about 90% of the 930 comparable items (median 850 W).

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Specifications

Product
Brand nameSilverStone
Product lineStrider Platinum series
Model nameSST-ST1200-PT
Product typeATX12 V / EPS12 V
Ports & slots
PCIe power connectors8 × 6+2-Pin
SATA power connectors16
Output type+3.3 V@22A, +5 V@25A, +12 V@100A, -
Connection types1 × 24 / 20-Pin motherboard connector
1 × 8 / 4-Pin EPS / ATX 12 V connector
1 × 8 / 4-Pin EPS / ATX 12 V connector
8 × 8 / 6-Pin PCIE connector
16 x SATA connector
6 × 4-Pin Peripheral connector
2 × 4-Pin Floppy connector
Power
Max wattage1200 W
Power efficiency89% - 92%
Power factor correctionActive
Main power connector20+4Pin
12V railsSingle
Efficiency certification80 PLUS PLATINUM Certified
Overvoltage protectionYes
Supply voltage105–264 V
AC input frequency47–63 Hz
Size & build
Product dimensions3.39 in × 5.91 in × 7.09 in
Product weight7.28 lb (3.3 kg)
Shipping weight4.50 kg
Package size366 × 236 × 130 mm
Compatibility
PSU length limit180 mm
More details
Fan configurationSingle 139 mm silent fan
Mean time between failures>100,000 h

Questions about this item

How do I install the Silverstone SST-ST1200-PT and which step is commonly missed?

Mount the 180 mm long unit with four screws, connect the 24-pin motherboard cable, both 8-pin EPS cables, required PCIe 6+2-pin cables, and SATA cables; the step often missed is plugging in both 8-pin EPS connectors for CPU power.

What maintenance or replacement will the Silverstone SST-ST1200-PT need later?

The 139 mm fan is the only moving part; clean dust from the included magnetised filter periodically, and if bearing noise appears after many years the fan can be replaced with a standard 139 mm unit.

What limit appears first on the Silverstone SST-ST1200-PT under sustained full load?

The single +12 V rail is rated at 100 A; once the combined GPU and CPU draw reaches that 100 A ceiling the over-current protection will trip, capping continuous output at 1200 W.

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