Seasonic VERTEX PX-1200 1200W 80+ Platinum ATX 3.0 PCIe 5.0 power supply

1200W ATX 3.0 Platinum Power Supply

The Seasonic VERTEX PX-1200 is a fully modular ATX power supply rated at 1200 W with 80 PLUS Platinum efficiency. It meets ATX 3.0 and PCIe 5.0 specifications and includes a native 12VHPWR cable. A 135 mm fluid dynamic bearing fan runs under Hybrid Silent Fan Control for low-noise operation. Japanese 105 °C capacitors and a DC-to-DC topology provide tight voltage regulation.

Ideal for High-End GPU Builds

This unit suits builders assembling systems with high-power graphics cards that require the 12VHPWR connection and demand Platinum-grade efficiency. The 160 mm depth fits most standard ATX cases, while full modularity keeps cable routing clean. Buyers who need more than 1200 W of continuous power should look at higher-capacity models. Systems that only require lower wattage or lack a 12VHPWR-equipped GPU will not use the headline features.

12VHPWR Connector Decides Fit

The included 16-pin 12VHPWR cable is the specification that determines whether this PSU matches the build. If the target graphics card draws power through that connector, the VERTEX PX-1200 delivers a direct, adapter-free link compliant with current standards. If the GPU uses traditional 8-pin PCIe connectors instead, the 12VHPWR cable remains unused and the buyer gains no advantage from the ATX 3.0 readiness.