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

Seasonic

Seasonic VERTEX1200P 1200W 80 PLUS Platinum power supply

SKU CH-SW1T-V9DGP MPN VERTEX1200P

A 1200 W ATX 3.0 power supply with 80 PLUS Platinum efficiency, a 135 mm FDB fan, hybrid silent fan control and a 16-pin 12VHPWR cable for PCIe 5.0 graphics cards

  • 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)
  • ModularFull Modular
  • Energy-Efficient80 PLUS PLATINUM Certified
  • 80 PLUS Platinum certified efficiency reduces wasted energy
  • ATX 3.0 compliant with 16-pin 12VHPWR cable for modern GPUs
  • Fully modular cabling keeps builds tidy and airflow clear
  • 135 mm FDB fan with hybrid silent control balances cooling and noise
  • Japanese 105 °C capacitors and ±3 % voltage regulation ensure stable power delivery

1200 W Platinum ATX 3.0 power supply

The Seasonic Vertex PX-1200 delivers 1200 W of continuous power with 80 PLUS Platinum efficiency. It targets builders who need headroom for high-end graphics cards and multi-drive arrays. The unit is fully modular so only the cables required for the build remain in the case. It is not suited to compact chassis that cannot accept a 6.3" deep unit.

135 mm FDB fan with hybrid silent control

A 135 mm fluid dynamic bearing fan runs under Seasonic hybrid silent fan control, offering fanless, silent and cooling modes. At low loads the fan stays off for zero noise, then ramps up only when thermals demand it. Platinum-rated efficiency keeps waste heat low, reducing the thermal load on the rest of the system. Japanese 105 °C capacitors maintain stable output under sustained draw.

ATX 3.0 compliant with 12VHPWR connector

The power supply includes a native 16-pin 12VHPWR cable that meets the ATX 3.0 and PCIe 5.0 specification for modern GPUs. Full modularity frees routing space behind the motherboard tray and improves airflow. Tight voltage regulation of ±3 % on the +12 V, 5 V and 3.3 V rails protects sensitive components. Builders needing more than 1200 W or a smaller form factor should look elsewhere.

Highlights

  • 80 PLUS Platinum certified efficiency reduces wasted energy
  • ATX 3.0 compliant with 16-pin 12VHPWR cable for modern GPUs
  • Fully modular cabling keeps builds tidy and airflow clear
  • 135 mm FDB fan with hybrid silent control balances cooling and noise
  • Japanese 105 °C capacitors and ±3 % voltage regulation ensure stable power delivery

Specifications

BrandSeaSonic
ModelVertex PX-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)
ModularFull Modular
Energy-Efficient80 PLUS PLATINUM Certified
OutputAmple +12 V Output
Dimensions6.3" L x 5.9" W x 3.4" H
Weight4.34lbs
Shipping weight4.08 kg
Package size345 × 191 × 122 mm

Questions about this item

Does the 12 VHPWR cable meet the ATX 3.0 and PCIe 5.0 specifications for new graphics cards?

Yes, the unit includes a 16-pin Gen 5 PCIe cable that is compliant with ATX 3.0 and PCIe 5.0.

Can I run the power supply without fan noise during light workloads?

The hybrid fan control offers a fanless mode that stops the 135 mm FDB fan at low loads.

What is the physical size of the unit so I can confirm it fits my case?

The dimensions are 6.3 inches long, 5.9 inches wide and 3.4 inches high.

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