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Seasonic · 1200 W · ATX

Seasonic Vertex PX-1200

ATX 3.0 · 80 PLUS Platinum · Modular

Capability: 90
Cap / price: 28
Wattage value: 30
Amazon: $320

View Seasonic Vertex PX-1200 Gallery in high resolution

Available on Amazon Updated Aug 30, 2026 Prime FBA

Capability90.2

Capability / price28.2

Wattage value30.0

$320 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 PX-1200 at a glance

The Seasonic Vertex PX-1200 is a 1200 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 90.2, averaging the available wattage, recorded efficiency percentage, and warranty inputs against fixed references. Listed warranty is 12 years. +12V output is 100 A.

Best fit: Systems whose component power budget calls for a supply rated at 1000 W or more.

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 100.00 A per rail. Certifications include 80 PLUS® Platinum.

Current value

At $320, price per kilowatt is $266.66. Capability / price is 28.2 and wattage value is 30.0. 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-1200
Launch price: —
Amazon price: $320
Amazon availability: Available
Price updated: Aug 30, 2026

Power & efficiency

Wattage: 1200 W
Efficiency: 80 PLUS Platinum
Recorded efficiency: 92%
Warranty: 12 years

Value

Amazon price: $320
Price / kW: $266.66
Capability: 90.2
Capability / price: 28.2
Wattage value: 30.0

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: 100 A
+5V output: 25 A
+3.3V output: 25 A
+12V rails: 1
Max amps / rail: 100.00 A

Cooling & build

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

Additional information

Also listed as: Vertex PX-1200

Amazon

Price history

Nearby capability

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Seasonic Seasonic VERTEX GX-1200 1200 W · ATX · Modular

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Seasonic Seasonic Vertex PX-1200 This PSU

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Corsair Corsair HX1500i 1500 W · ATX · Modular

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NZXT NZXT C1500 Platinum ATX 3.1 1500 W · ATX · Modular

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be quiet! be quiet! Straight Power 12 1500W 1500 W · ATX · Modular

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Cooler Master Cooler Master X Silent Edge Platinum 850 Fanless 850 W · ATX · Modular

91.5

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MSI MSI MEG Ai1300P 1300 W · ATX · Modular

92.2

26.3

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Seasonic Seasonic Prime TX-1300 1300 W · ATX · Modular

92.9

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Thermaltake Thermaltake Toughpower GF3 1650W 1650 W · ATX · Modular

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Compare these in the PSU table

Discussion

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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.

High Efficiency, 80 PLUS Platinum Certified

ATX 3.0 and 16-Pin Gen 5 PCIe Cable (12VHPWR)

Fully Modular Cabling Design

135 mm Fluid Dynamic Bearing (FDB) Fan

Seasonic Hybrid Silent Fan Control

Seasonic Vertex PX-1200 at a glance

Platform and cooling

Current value

General

Power & efficiency

Value

Platform & size

Electrical

Cooling & build

Additional information

Price history

Similar PSUs

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Amazon listing details

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