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

Seasonic

Seasonic Vertex GX-850 850 W power supply

SKU CH-KCM7-3DFPM MPN Vertex GX-850

An ATX 3.0 compatible, fully modular 850 W unit with a 16-pin Gen 5 PCIe cable, 135 mm FDB fan, Japanese 105 °C capacitors and Cybenetics A noise rating

  • TypeATX / ATX 3.0 Compatible
  • Maximum Power850 W
  • Fans1 x 135 mm Fluid Dynamic Bearing (FDB) Fan
  • PCI-Express Connector16-Pin Gen 5 PCIe Cable (12VHPWR)
  • Max PSU Length160 mm
  • ModularFull Modular

Options ATX 3.0 Gold (850W)

  • ATX 3.0 and PCIe 5.0 ready for modern GPU builds
  • 80 PLUS Gold certification delivers high efficiency under load
  • Fully modular cabling keeps the interior clean and airflow unobstructed
  • 135 mm Fluid Dynamic Bearing fan with hybrid silent control runs quietly
  • Japanese 105 °C capacitors provide long-term reliability

850 W ATX 3.0 power supply

This 850 W unit follows the ATX 3.0 standard and includes a 16-pin 12VHPWR cable for PCIe 5.0 graphics cards. It is fully modular and uses a 135 mm fluid dynamic bearing fan with hybrid silent control. Japanese 105 °C capacitors and tight voltage regulation support stable delivery.

Suited for single-GPU builds, not multi-GPU

Builders assembling a high-performance system with one modern GPU will find the 850 W capacity and single 12VHPWR connector a direct match. The fully modular design keeps cable routing clean. Systems that require two or more 12VHPWR connections, or that need more than 850 W for extreme overclocking, should look at a higher-wattage or multi-connector unit.

One 12VHPWR cable included

The box provides a single 16-pin Gen 5 PCIe cable (12VHPWR) for the graphics card. If your GPU requires two such connectors, or if you plan to run dual cards each needing 12VHPWR, this unit cannot supply them natively.

Points forts

  • ATX 3.0 and PCIe 5.0 ready for modern GPU builds
  • 80 PLUS Gold certification delivers high efficiency under load
  • Fully modular cabling keeps the interior clean and airflow unobstructed
  • 135 mm Fluid Dynamic Bearing fan with hybrid silent control runs quietly
  • Japanese 105 °C capacitors provide long-term reliability

Caractéristiques

BrandSeaSonic
ModelVertex GX-850
TypeATX / ATX 3.0 Compatible
Maximum Power850 W
Fans1 x 135 mm Fluid Dynamic Bearing (FDB) Fan
PCI-Express Connector16-Pin Gen 5 PCIe Cable (12VHPWR)
Max PSU Length160 mm
ModularFull Modular
Energy-Efficient80 PLUS GOLD Certified
PSU Noise LevelCybenetics A
OutputAmple +12 V Output
Dimensions6.3" x 5.9" x 3.4"
Weight4.34lbs
Poids d’expédition3.83 kg
Dimensions du colis345 × 189 × 114 mm

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Questions sur cet article

What case clearance does the 160 mm length and 135 mm fan require?

The unit is 160 mm long and uses a single 135 mm Fluid Dynamic Bearing fan, so your chassis must provide at least that depth and vertical clearance above the PSU mounting area.

Which cables must be attached during installation, and which step is often missed?

Connect the 24-pin ATX, CPU 8-pin, and the 16-pin 12VHPWR cable for the GPU; the step most builders forget is fully seating the 12VHPWR connector until the latch clicks.

When should the 105 °C Japanese electrolytic capacitors be inspected or replaced?

These capacitors are rated for long life at 105 °C; under normal desktop use they typically last well beyond the 12-year warranty period, so no scheduled replacement is needed.

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