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Seasonic · 850 W · ATX

Seasonic Vertex PX-850

ATX 3.0 · 80 PLUS Platinum · Modular

Capability
83
Cap / price
95
Wattage value
78
Amazon
$88
Seasonic Vertex PX-850
View Seasonic Vertex PX-850 Gallery in high resolution
$88
Not currently available Updated Dec 7, 2025
Capability83.1
Capability / price94.9
Wattage value77.6
$88 on Amazon PSU table Compare this PSU

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Written analysis

Seasonic Vertex PX-850 at a glance

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

The calculated capability score is 83.1, 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® Platinum.

Current value

At $88, price per kilowatt is $103.11. Capability / price is 94.9 and wattage value is 77.6. 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 PX-850
Launch price
—
Amazon price
$88
Amazon availability
Not currently available
Price updated
Dec 7, 2025

Power & efficiency

Wattage
850 W
Efficiency
80 PLUS Platinum
Recorded efficiency
92%
Warranty
12 years

Value

Amazon price
$88
Price / kW
$103.11
Capability
83.1
Capability / price
94.9
Wattage value
77.6

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® Platinum

Additional information

Also listed as
Vertex PX-850
Color
Black

Amazon

Price history

Nearby capability

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Vendor copy

Amazon listing details

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

Fully compatible with ATX 3.0 and PCIe 5.0 standards

Full modularity for the best cable management options

Added 12VHPWR cable to comply with the new graphic cards

135Mm fluid dynamic bearing fan for quiet operation

Seasonic hybrid silent fan control for optimal cooling

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