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Seasonic CORE GX-1000 ATX 3.1 power supply, matte black rectangular unit with 120 mm fan grille and modular cable sockets

Seasonic

Seasonic CORE GX-1000 ATX3 1000 W power supply, fully modular ATX 3.1, 120 mm fan, 140 mm depth

SKU CH-JQ12-WKKVT MPN CORE GX-1000 ATX3

Fully modular 1000 W ATX 3.1 unit with 120 mm HDB fan, 140 mm depth, 80 PLUS Gold efficiency and Cybenetics A- noise rating

  • Max wattage1000 W
  • Modular cablingFull Modular
  • Fan configuration1 × 120 mm
  • PSU length limit140 mm
  • Efficiency certification80 PLUS GOLD Certified
  • PSU noise ratingCybenetics A-

Wattage 1000W

  • Delivers 1000 W for demanding builds
  • Fully modular cables keep the interior tidy
  • 120 mm hydro-dynamic bearing fan runs quietly at Cybenetics A-
  • 80 PLUS Gold certification reduces wasted energy
  • Compact 140 mm depth fits smaller ATX cases

1000 W ATX 3.1 power supply

The Seasonic CORE GX-1000 ATX3 delivers 1000 W of continuous power for high-end desktop builds. Its ATX 3.1 compliance ensures compatibility with modern graphics cards and motherboards. The unit targets enthusiasts and workstation users who need reliable, high-wattage output without excess bulk. Full modular cabling keeps the interior clean and simplifies cable routing.

140 mm depth with 120 mm HDB fan

A 140 mm chassis depth allows installation in many compact cases where longer units would not fit. The 120 mm hydro dynamic bearing fan provides durable airflow while maintaining a low acoustic profile. All cables detach completely so only the required connectors remain in the build. The included 16-pin 12V-2x6 cable supports PCIe Gen 5.1 graphics cards directly.

80 PLUS Gold and Cybenetics A- ratings

80 PLUS Gold certification confirms high efficiency across typical load ranges, reducing waste heat and electricity cost. Cybenetics A- noise rating indicates quiet operation under normal gaming or productivity workloads. The single fan design balances thermal performance with minimal sound output. Stable power delivery supports sustained heavy loads without thermal throttling.

How it compares

Measured against everything we stock in ATX Desktop Power Supplies, at today’s prices. Recalculated every night.

Price $117.99
Cheaper than about 60% of the 10,869 comparable items (median $142.99).
Max wattage 1000 W
Higher than about 70% of the 930 comparable items (median 850 W).

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Specifications

Product
Brand nameSeaSonic
Model nameCORE GX-1000 ATX3
Product typeATX 3.1
Power
Max wattage1000 W
Modular cablingFull Modular
Efficiency certification80 PLUS GOLD Certified
Size & build
Shipping weight3.22 kg
Package size269 × 188 × 114 mm
Compatibility
PSU length limit140 mm
Environment & compliance
PSU noise ratingCybenetics A-
More details
Fan configuration1 × 120 mm

Other versions of this model

2 more in the same range

Questions about this item

What does the ATX 3.1 standard mean for this power supply's power delivery ceiling?

ATX 3.1 certifies the unit for 1000 W continuous output and includes a native 16-pin 12V-2x6 cable rated for PCIe Gen 5.1 graphics cards.

What clearance does the 140 mm depth require inside the chassis?

The case must provide at least 140 mm of uninterrupted PSU bay length from the rear panel to any drive cage or motherboard tray obstruction.

Which cables must be attached before the first boot because the unit is fully modular?

Connect the 24-pin ATX, the 8-pin EPS, and the 16-pin 12V-2x6 PCIe cables; the most common mistake is leaving the EPS cable loose and getting no post.

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