This article covers Seasonic Vertex 1200W (GX-1200) 80 プラス ゴールド モジュラー PSU ATX 3.0.

Overview

The Seasonic Vertex GX-1200 is a 1200W fully modular power supply with 80 PLUS Gold certification, designed to meet the ATX 3.0 and PCIe 5.0 standards. It ships with a dedicated 12VHPWR cable, making it an excellent choice for high-end graphics cards like the RTX 4090. The compact 135mm FDB fan and hybrid fan control ensure silent operation under light loads. With robust build quality and comprehensive protection circuitry, this PSU delivers stable, efficient power for demanding gaming or workstation builds.

Compatibility Guide

Built on the standard ATX form factor (150x160x86mm), the Vertex GX-1200 fits most mid-tower and full-tower cases. It provides a full complement of connectors: one 24-pin main, two EPS12V (4+4 pin) for CPU, six PCIe 6+2 pin, and one 12VHPWR (12+4 pin) connector. The ATX 3.0 compliance means it can handle transient power spikes of up to 200% of rated wattage for short durations, ensuring compatibility with next-generation GPUs. Always verify your case's PSU clearance (minimum 160mm depth) and your motherboard's EPS connector requirements before purchase.

Product Info

Launched in 2023, the Seasonic Vertex GX-1200 occupies the high-end tier of the consumer PSU market. It delivers 1200W continuous power with 80 PLUS Gold efficiency (up to 90% at 50% load). The fully modular cabling system reduces clutter and improves airflow. A 135mm fluid dynamic bearing fan with hybrid mode stops the fan below roughly 30% load for silent operation. Protection includes OCP, OVP, UVP, SCP, OPP, and OTP. The unit also carries a 10-year warranty (varies by region), reflecting Seasonic's confidence in its longevity.

Best Use Cases

  • High-end gaming: Perfect for systems with an RTX 4090/5080 or future GPUs that require 12VHPWR connectors. The 1200W headroom provides ample power for overclocking and RGB peripherals. - Professional creative work: For users running CPU-intensive rendering or AI models with multiple GPUs, the stable voltage regulation and high efficiency reduce heat and power costs. - Silent computing enthusiasts: The hybrid fan control makes this PSU virtually inaudible during everyday tasks, ideal for home theater PCs or quiet office builds.

Things to Consider

At 1200W, this PSU is overkill for mid-range builds (e.g., RTX 4060 + Ryzen 5). A 750W or 850W unit would be more cost-effective. The physical size (160mm depth) may not fit compact cases like the Fractal Terra or smaller ITX enclosures; measure your case's PSU compartment first. Also, the dual EPS12V connectors support only single-socket motherboards; dual-socket workstation boards may require two separate PSUs or a unit with four EPS connectors. Despite these caveats, for top-tier builds, the Vertex GX-1200 remains a reliable and feature-rich choice.

Product Disclosure (Amazon)

  • Manufacturer: Seasonic
  • Seller: S.K dreams 39 ショップ
  • Fulfilled by: S.K dreams 39 ショップ
  • ASIN: B0BVP4GM9S
  • Note: This article covers a manufacturer-made product based on Amazon listing details.