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Silver rectangular ATX power supply unit with modular cable ports and single 120mm fan grille

Silverstone

Silverstone SST-ST1200-PTS 1200 W power supply

SKU CH-SGVZ-05JAR MPN SST-ST1200-PTS

A 1200 W ATX power supply with 80 PLUS Platinum efficiency, full modular cables and a single +12 V rail rated at 100 A

  • Max wattage1200 W
  • Power efficiency89% - 92% at 20% - 100% loading
  • Modular cablingFull Modular
  • Fan configurationSingle 120 mm HYB fan
  • Power factor correctionActive
  • Main power connector20+4Pin
  • 1200 W output powers demanding builds with a single +12V rail rated at 100 A
  • 80 PLUS Platinum certification delivers 89 % to 92 % efficiency from 20 % to 100 % load
  • Full modular design with flat 24-pin cables enables clean routing and reduced clutter
  • 120 mm HYB fan plus magnetic dust filter provides quiet cooling while limiting dust ingress
  • Compact 140 mm depth fits high-wattage needs into smaller chassis

Power for demanding systems

The Silverstone SST-ST1200-PTS is a 1200 W ATX12V v2.4 power supply built for high-output PCs. It carries 80 PLUS PLATINUM certification and delivers 89% to 92% efficiency across 20% to 100% loading. A single +12V rail rated at 100A supports heavy GPU and CPU loads. Over voltage protection is included for component safety.

Build integration and cable freedom

Full modular cabling lets you attach only the leads your build requires, reducing clutter inside the chassis. The unit provides eight 6+2-pin PCI-Express connectors and eight SATA power connectors for multiple drives and graphics cards. Flat 24-pin cables improve routing in tight spaces. At 140 mm deep, the PSU fits many standard ATX cases while leaving room for cable bends behind the motherboard tray.

Who this suits and who should look elsewhere

This unit suits builders assembling multi-GPU workstations or heavily overclocked rigs that demand 1200 W of continuous platinum-rated power. The single-rail design simplifies load balancing for extreme configurations. Systems with modest components or lower wattage needs will find the capacity and cost excessive; a smaller gold or bronze unit would be more appropriate.

How it compares

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

Price $234.99
Pricier than about 70% 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-PTS
Product typeATX12 V v2.4
Ports & slots
PCIe power connectors8 × 6+2-Pin
SATA power connectors8
Output type+3.3 V@25A, +5 V@22A, +12 V@100A, +5VSB@3A
Connection types1 × 24 / 20-Pin motherboard connector("600 mm")
1 × 8 / 4-Pin EPS / ATX 12 V connector("550 mm")
1 × 8 / 4-Pin EPS / ATX 12 V connector("750 mm")
8 × 8 / 6-Pin PCIE connector("550 mm/150 mm" x4)
8 x SATA connector("600 mm /150 mm / 150 mm / 150 mm" x2)
6 × 4-Pin Peripheral connector("600 mm / 150 mm / 150 mm" x2)
2 × 4-Pin Floppy connector("150 mm" x2)
Power
Max wattage1200 W
Power efficiency89% - 92% at 20% - 100% loading
Modular cablingFull Modular
Power factor correctionActive
Main power connector20+4Pin
12V railsSingle
Efficiency certification80 PLUS PLATINUM Certified
Overvoltage protectionYes
Supply voltage115–240 V
AC input frequency50/60 Hz
Rated input current12–6A
Size & build
Product dimensions3.39 in × 5.91 in × 5.51 in
Product weight4.41 lb (2 kg)
Shipping weight3.63 kg
Package size381 × 254 × 127 mm
Compatibility
PSU length limit140 mm
More details
Fan configurationSingle 120 mm HYB fan
Mean time between failures100,000 h

Questions about this item

At what load does the 1200 W unit reach its peak 92 % efficiency?

The Platinum rating guarantees 92 % efficiency at 100 % load, with 89 % at 20 % load and a flat curve across the 20–100 % range.

How loud is the 120 mm HYB fan when the PSU runs at full load all day?

The 120 mm HYB fan is designed for high airflow at low noise; a magnetic dust filter keeps the heatsink clean so fan speed stays steady during continuous operation.

Which power cables must my graphics cards already use to plug into the eight PCIe ports?

Each of the eight PCIe connectors is a 6+2-pin design, so cards with either 6-pin or 8-pin sockets will attach directly without adapters.

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