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Seasonic · 850 W · ATX

Seasonic Vertex GX-850

ATX 3.0 · 80 PLUS Gold · Modular

Capability: 82
Cap / price: 28
Wattage value: 23
Amazon: $296

View Seasonic Vertex GX-850 Gallery in high resolution

Available on Amazon Updated Aug 30, 2026 Prime FBA

Capability82.4

Capability / price27.8

Wattage value22.9

$296 on Amazon PSU table Compare this PSU

Size this PSU for a complete buildThe Builder unlocks PSU choices after it knows the CPU, GPU, case format, and estimated demand. Calculate build power first

Written analysis

Seasonic Vertex GX-850 at a glance

The Seasonic Vertex GX-850 is a 850 W ATX power supply built to the ATX 3.0 generation. Efficiency is listed as 80 PLUS Gold. Cables are modular. It supports fan-stop at low load.

The calculated capability score is 82.4, averaging the available wattage, recorded efficiency percentage, and warranty inputs against fixed references. Listed warranty is 12 years. +12V output is 70 A.

Best fit: Performance desktops whose calculated component load fits comfortably within a 750–999 W supply.

Platform and cooling

Dimensions are listed as 160 × 150 × 86 mm. Cooling fan size is 135 mm. The unit uses 1 +12V rail at up to 70.00 A per rail. Certifications include 80 PLUS®Gold.

Current value

At $296, price per kilowatt is $348.64. Capability / price is 27.8 and wattage value is 22.9. Compare nearby supplies below; wattage alone does not determine value.

Unit data

Full specifications

Wattage, efficiency, platform size, electrical outputs, connectors, cooling, and value in one technical sheet.

General

Manufacturer: Seasonic
PSU: Seasonic Vertex GX-850
Launch price: —
Amazon price: $296
Amazon availability: Available
Price updated: Aug 30, 2026

Power & efficiency

Wattage: 850 W
Efficiency: 80 PLUS Gold
Recorded efficiency: 90%
Warranty: 12 years

Value

Amazon price: $296
Price / kW: $348.64
Capability: 82.4
Capability / price: 27.8
Wattage value: 22.9

Platform & size

ATX generation: 3.0
Form factor: ATX
Dimensions: 160 × 150 × 86 mm
Modular: Yes
Fanless: No

Electrical

Input voltage: 100-240
+12V output: 70 A
+5V output: 20 A
+3.3V output: 20 A
+12V rails: 1
Max amps / rail: 70.00 A

Cooling & build

Fan size: 135 mm
Fan stop: Yes
Certifications: 80 PLUS®Gold

Additional information

Also listed as: Vertex GX-850

Amazon

Price history

Nearby capability

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Seasonic Seasonic Vertex GX-850 This PSU

82.4

27.8

22.9

$296

Seasonic Seasonic Vertex PX-850 850 W · ATX · Modular

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Amazon listing details

Marketplace feature text kept for reference. Structured specifications above are the source for scores and comparisons.

W128282364

Seasonic Vertex GX-850 at a glance

Platform and cooling

Current value

General

Power & efficiency

Value

Platform & size

Electrical

Cooling & build

Additional information

Price history

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