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Rectangular ATX power supply unit in matte black finish with gold efficiency badge

Seasonic

Seasonic Vertex GX-1200 1200W 80+ Gold ATX power supply

SKU CH-H32S-MYQHK

Delivers 1200 W of 80+ Gold certified ATX power for high-performance systems

  • Max wattage1200 W
  • Product typeATX
  • 1200W output powers high-end multi-GPU builds
  • 80+ Gold certification reduces wasted energy
  • ATX form factor fits standard PC cases
  • New condition ensures full manufacturer quality

High-wattage ATX power supply

The Seasonic Vertex GX-1200 delivers 1200 W of continuous power in a standard ATX form factor. It is built for workstations and enthusiast PCs that run multiple high-end GPUs or heavily overclocked CPUs. The unit carries an 80+ Gold efficiency rating for reduced waste heat.

Practical limits of the ATX standard

The ATX form factor fits most mid-tower and full-tower cases, but compact chassis may lack the depth or cable routing space required. The 1200 W ceiling suits extreme multi-GPU builds, yet systems with modest components will not benefit from the extra headroom. Buyers who need more than 1200 W must look at redundant or server-grade solutions instead.

How it compares

Measured against everything we stock in ATX Desktop Power Supplies, at today’s prices. Recalculated every night.

Price $139.99
Typical for this category: the median of 10,869 items is $142.99.
Max wattage 1200 W
Higher than about 90% of the 930 comparable items (median 850 W).

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Specifications

Product
Brand nameSeaSonic USA
Part numberVertex GX-1200
Product typeATX
Power
Max wattage1200 W

Questions about this item

Should I choose the 1200W Vertex GX-1200 or a lower-wattage unit for my build?

Choose the 1200W model when your components draw close to that ceiling; a lower-wattage unit is fine if total load stays well below 1200W.

What does the 80+ Gold rating mean for daily power draw?

It means the supply runs at least 80 percent efficiency at typical loads, turning more wall power into usable DC and less into heat.

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