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Rectangular black ATX power supply unit with Seasonic branding and 850W label

Seasonic

Seasonic Vertex GX-850 850W ATX power supply

SKU CH-4NQ3-9FDKW

An 850W ATX power supply delivering 80+ Gold efficiency for reliable system power

  • Max wattage850 W
  • Product typeATX
  • 850 W output powers demanding builds
  • 80 Plus Gold rating cuts energy waste
  • ATX form factor fits standard cases
  • New condition ensures full reliability

850W ATX power supply

This 850W ATX unit is rated at 80+ Gold efficiency and delivers a maximum output of 850W. It fits standard ATX cases and is built for desktop systems that require reliable power delivery. The power supply is new and ready for installation.

Suited for builds needing 850W Gold-rated power

This unit serves systems that need an 850W ATX supply with 80+ Gold certification. It is not intended for configurations that demand a higher maximum wattage or a different form factor. Builders requiring other specifications should consider alternative options.

How it compares

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

Price $111.99
Cheaper than about 62% of the 10,869 comparable items (median $142.99).
Max wattage 850 W
Typical for this category: the median of 930 items is 850 W.

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Specifications

Product
Brand nameSeaSonic USA
Part numberVertex GX-850
Product typeATX
Power
Max wattage850 W

Questions about this item

Will the fan need replacement after long-term use?

The 100 mm fan is rated for continuous operation and is not a user-serviceable part.

What limits sustained output at full 850 W load?

The 80 Plus Gold efficiency target means heat rises first, so thermal protection will throttle before the electrical limit is reached.

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