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Seasonic · 1200 W · ATX

Seasonic VERTEX GX-1200

ATX 3.0 · 80 PLUS Gold · Modular

Capability: 89
Cap / price: 53
Wattage value: 56
Amazon: $170

View Seasonic VERTEX GX-1200 Gallery in high resolution

Available on Amazon Updated Aug 30, 2026 Prime FBA

Capability89.5

Capability / price52.6

Wattage value56.5

$170 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-1200 at a glance

The Seasonic VERTEX GX-1200 is a 1200 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 89.5, 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®Gold.

Current value

At $170, price per kilowatt is $141.66. Capability / price is 52.6 and wattage value is 56.5. 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-1200
Launch price: —
Amazon price: $170
Amazon availability: Available
Price updated: Aug 30, 2026

Power & efficiency

Wattage: 1200 W
Efficiency: 80 PLUS Gold
Recorded efficiency: 90%
Warranty: 12 years

Value

Amazon price: $170
Price / kW: $141.66
Capability: 89.5
Capability / price: 52.6
Wattage value: 56.5

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®Gold

Additional information

Also listed as: VERTEX GX-1200

Amazon

Price history

Nearby capability

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Seasonic Seasonic VERTEX GX-1200 This PSU

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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.

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 (FDB) fan for quiet operation

Seasonic Hybrid Silent Fan Control for optimal cooling

Seasonic VERTEX GX-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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