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Rectangular black metal ATX power supply unit with modular cable sockets and 135 mm fan grille

Seasonic

Seasonic VERTEX1200G 1200 W 80 PLUS Gold ATX 3.0 power supply

SKU CH-F5B9-3R730 MPN VERTEX1200G

Full-modular ATX 3.0 power supply delivering 1200 W with 80 PLUS Gold efficiency, a 135 mm FDB fan, Japanese 105 °C capacitors and a 16-pin 12VHPWR cable for modern GPUs

  • TypeATX / ATX 3.0 Compatible
  • Maximum Power1200 W
  • Fans135 mm Fluid Dynamic Bearing (FDB) Fan
  • PCI-Express ConnectorATX 3.0 and 16-Pin Gen 5 PCIe Cable (12VHPWR)
  • Max PSU Length160 mm
  • ModularFull Modular

Options ATX 3.0 Gold (1200W)

  • 80 PLUS Gold certification delivers high efficiency
  • ATX 3.0 and 12VHPWR cable support modern GPUs
  • Full modular cabling keeps builds clean
  • 135 mm FDB fan with hybrid control runs quietly
  • Japanese 105 °C capacitors ensure long-term reliability

1200 W ATX 3.0 power supply

The Seasonic VERTEX1200G delivers 1200 W of continuous power and meets the ATX 3.0 specification. It is built for systems that draw heavy current from the +12 V rail, such as workstations or high-end gaming rigs with modern graphics cards. The unit carries 80 PLUS Gold certification for efficient operation.

Full-modular design with 16-pin Gen 5 cable

All cables detach from the unit, so only the required leads occupy space inside the chassis. A native 16-pin 12VHPWR connector is included, removing the need for adapters when installing ATX 3.0-ready GPUs. The 160 mm depth fits standard ATX bays without intruding on drive cages or long graphics cards.

Hybrid fan control and Japanese capacitors under

A 135 mm fluid-dynamic-bearing fan runs under Seasonic Hybrid Silent Fan Control, staying quiet at low loads and ramping up only when thermal sensors demand it. Premium 105 °C Japanese electrolytic capacitors maintain tight voltage regulation across the +12 V, 5 V and 3.3 V rails during sustained output. The platform is rated for continuous delivery at its full 1200 W rating.

Points forts

  • 80 PLUS Gold certification delivers high efficiency
  • ATX 3.0 and 12VHPWR cable support modern GPUs
  • Full modular cabling keeps builds clean
  • 135 mm FDB fan with hybrid control runs quietly
  • Japanese 105 °C capacitors ensure long-term reliability

Caractéristiques

BrandSeaSonic
ModelVertex GX-1200
TypeATX / ATX 3.0 Compatible
Maximum Power1200 W
Fans135 mm Fluid Dynamic Bearing (FDB) Fan
PCI-Express ConnectorATX 3.0 and 16-Pin Gen 5 PCIe Cable (12VHPWR)
Max PSU Length160 mm
ModularFull Modular
Energy-Efficient80 PLUS GOLD Certified
OutputAmple +12 V Output
Dimensions6.3" L x 5.9" W x 3.4" H
Weight4.34lbs
Poids d’expédition4.04 kg
Dimensions du colis345 × 185 × 114 mm

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Questions sur cet article

How much continuous power can the +12 V rail deliver on this 1200 W unit?

The supply is rated for 1200 W total with ample +12 V output, so the 12 V rail can provide essentially the full 1200 W under sustained load.

What fan noise and temperature behaviour should I expect during all-day operation?

The 135 mm FDB fan runs under Seasonic Hybrid Silent Fan Control, staying quiet at low loads and ramping up only when internal temperatures rise.

Which cables and connectors must already be in my build for this PSU to work?

You need a motherboard with a 24-pin ATX socket, a CPU 8-pin (or 4+4) header, and a GPU that accepts the included 12VHPWR 16-pin connector for ATX 3.0 power delivery.

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