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Rectangular black ATX power supply unit with fully modular cable sockets and a 120 mm fan grille

Seasonic

Seasonic CORE GX-650 ATX3 650 W power supply

SKU CH-5NX2-FPE77 MPN CORE GX-650 ATX3

A fully modular ATX unit delivering 650 W with an 80 PLUS Gold rating, a 120 mm HDB fan and a 16-pin PCIe Gen 5 cable in a 140 mm chassis

  • TypeATX Fully Modular
  • Maximum Power650 W
  • Fans120 mm Hydro Dynamic Bearing (HDB) Fan
  • PCI-Express ConnectorATX 3 and 16-Pin PCIe Gen 5 Cable (12V-2x6)
  • Max PSU Length140 mm
  • ModularFull Modular

Options 650W

  • Fully modular design simplifies cable management and airflow
  • 80 PLUS Gold certification reduces wasted energy and heat
  • 120 mm Hydro Dynamic Bearing fan runs quietly under load
  • Compact 140 mm depth fits smaller ATX cases
  • ATX 3.0 compliant 16-pin 12V-2x6 cable supports modern GPUs

Capacity and headroom

This 650 W unit delivers stable power for mid-range gaming PCs and workstations with a single modern GPU. The 80 PLUS Gold certification means high efficiency across typical loads, reducing waste heat. Headroom remains comfortable for one graphics card and several drives. Builds that require dual GPUs or extreme overclocking will exceed the rated output.

ATX 3 and 16-Pin PCIe Gen 5 connector

The supply includes the new 12V-2x6 cable required by current-generation graphics cards. Full modularity lets you attach only the cables your build needs, keeping the interior tidy. The 140 mm housing fits most standard ATX cases without clearance issues. Older platforms that lack the 16-pin socket will need an adapter.

120 mm Hydro Dynamic Bearing fan

The HDB fan runs quietly at low and medium loads thanks to its fluid-bearing design. Under sustained heavy draw the fan speed increases to maintain safe temperatures, but acoustic output stays moderate. Gold-rated efficiency keeps internal heat lower than bronze-class units, helping the fan stay at slower speeds longer.

Highlights

  • Fully modular design simplifies cable management and airflow
  • 80 PLUS Gold certification reduces wasted energy and heat
  • 120 mm Hydro Dynamic Bearing fan runs quietly under load
  • Compact 140 mm depth fits smaller ATX cases
  • ATX 3.0 compliant 16-pin 12V-2x6 cable supports modern GPUs

Specifications

BrandSeaSonic
ModelCORE GX-650 ATX3
TypeATX Fully Modular
Maximum Power650 W
Fans120 mm Hydro Dynamic Bearing (HDB) Fan
PCI-Express ConnectorATX 3 and 16-Pin PCIe Gen 5 Cable (12V-2x6)
Max PSU Length140 mm
ModularFull Modular
Energy-Efficient80 PLUS GOLD Certified
Shipping weight2.95 kg
Package size305 × 178 × 127 mm

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Questions about this item

Will the 120 mm Hydro Dynamic Bearing fan fit and run quietly in an older case with limited clearance?

The power supply is 140 mm long and uses a single 120 mm HDB fan, so it fits most legacy ATX cases and keeps noise low under typical loads.

How can I verify the unit is delivering stable power after installation?

Check that the system posts without voltage warnings, monitor 12 V rail readings in BIOS or software, and confirm the 80 PLUS GOLD efficiency rating under load.

Does the box include the 16-pin 12V-2x6 cable for a new graphics card, or must I buy it separately?

The fully modular package ships with the ATX 3.0 16-pin PCIe Gen 5 cable (12V-2x6) included, so no separate purchase is needed for that connection.

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