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Seasonic Vertex GX-850-850W - 80+ Gold - ATX 3.0 & PCIe 5.0 Ready - Fully Modular - Premium Japanese Capacitors - 12 Year Warranty - Nvidia RTX 40/50 & AMD GPU Compatible
Seasonic

Seasonic Vertex GX-850-850W

Bottom line: The Seasonic Vertex GX-850-850W ($299.00 on Amazon as of 2026-10-06): Native 600W 12VHPWR cable powers PCIe 5.0 GPUs without adapters; main trade-off: 850W leaves less headroom for flagship GPUs paired with high-draw CPUs.

$299.00

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Buy on Amazon — $299.00 Compare to similar power supplies

By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014, focused on GPU performance across gaming, rendering, and local-LLM inference. Synthesises community benchmarks, manufacturer specs, and public forum data into actionable buying guides.

*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.

Pros & Cons

Pros

  • ✓ Native 600W 12VHPWR cable powers PCIe 5.0 GPUs without adapters
  • ✓ ATX 3.0 compliant, built for Nvidia RTX 40/50-series and AMD graphics cards
  • ✓ Fully modular cabling: install only the leads your build needs
  • ✓ 12-year manufacturer warranty for long-term builds
  • ✓ Fanless, Silent and Cooling modes keep noise down at light loads

Cons

  • ✗ 850W leaves less headroom for flagship GPUs paired with high-draw CPUs
  • ✗ Listing specifies ATX 3.0 and 12VHPWR, not the newer ATX 3.1 / 12V-2x6
  • ✗ Costs more than 80+ Bronze units of the same wattage
  • ✗ Listing omits unit length; confirm PSU clearance in compact cases

Manufacturer description

*ATX 3.0 and PCIe Gen 5 ready with 600W 12VHPWR Gen 5 cable. *It is a flexible solution that optimizes cable management and reduces clutter inside the computer case. *Improved load regulation reduces voltage variations to provide smooth and stable operations. *The lubrication inside the FDB greatly reduces friction, vibration and noise and increases the lifetime of the fan. *The industry's first three-phased advanced thermal control achieves an ideal balance between silence and cooling at all loads via three operational stages: Fanless Mode, Silent Mode, and Cooling Mode. The benefits of…

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SpecPicks Verdict

SpecPicks scored Seasonic Vertex GX-850-850W using a rating × review-volume × price-fit model applied to published specs and reviews across the power supplies category. Seasonic's power supplies lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for power supplies of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Key Features

  • W128282364

Full Specifications

BrandSeasonic
Wattage850 watts
Model NameVERTEX GX-850
Unit Count1 Count
Form FactorATX
Model NumberVERTEX GX-850
Connector Typeatx,pcie
Cooling MethodAir
Number of Fans1
Output Wattage850
Item Dimensions6.3 x 5.9 x 3.4 inches
Mfr Part NumberVERTEX GX-850
Number of Items1
Compatible DevicesPersonal Computer
Power Supply DesignFull Modular
Warranty Description10 years
Maximum Input Voltage240 volts_of_alternating_current
Minimum Input Voltage100 volts_of_alternating_current
Item dimensions L x W x H6.3 x 5.9 x 3.4 inches
System Bus Connector Type16 Pin
Full listing titleSeasonic Vertex GX-850-850W - 80+ Gold - ATX 3.0 & PCIe 5.0 Ready - Fully Modular - Premium Japanese Capacitors - 12 Year Warranty - Nvidia RTX 40/50 & AMD GPU Compatible

Ready to buy?

Seasonic Vertex GX-850-850W - 80+ Gold - ATX 3.0 & PCIe 5.0 Ready - Fully Modular - Premium Japanese Capacitors - 12 Year Warranty - Nvidia RTX 40/50 & AMD GPU Compatible is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

Buy on Amazon — $299.00

*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.

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Seasonic Vertex GX-850-850W - 80+ Gold - ATX 3.0 & PCIe 5.0 Ready - Fully Modular - Premium Japanese Capacitors - 12 Year Warranty - Nvidia RTX 40/50 & AMD GPU Compatible
$299.00
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