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Rectangular black metal box with a 120mm fan grille, semi-modular cable sockets and a compact 140mm depth

Seasonic

Seasonic FOCUS GM-650 650W 80+ Gold semi-modular power supply

SKU CH-GRCJ-FRMC4 MPN FOCUS GM-650

A 650 W ATX power supply with 80 PLUS Gold efficiency, a 120 mm fluid-dynamic-bearing fan, semi-modular cables and a compact 140 mm depth that fits all ATX cases

  • TypeIntel ATX 12 V
  • Maximum Power650 W
  • Fans120mm Fluid Dynamic Bearing Fan
  • Main Connector20+4Pin
  • +12V RailsSingle
  • PCI-Express Connector2 x 6+2-Pin

Options ATX 80+ Gold (650W) Semi-Modular

Struck-through versions exist but are not stocked here.

  • 650 W output powers demanding builds
  • 80 PLUS Gold certification cuts wasted energy
  • 140 mm depth fits every ATX case
  • semi-modular cabling reduces clutter for better airflow
  • 120 mm fluid dynamic bearing fan with smart silent control optimises noise

Compact 140 mm depth

The Seasonic FOCUS GM-650 is a 650 W ATX 12 V power supply built for standard desktop systems. Its 140 mm length allows installation in virtually any ATX case, while the single +12 V rail delivers up to 54 A for stable GPU and CPU power. The unit carries 80 PLUS Gold certification for high conversion efficiency across typical loads.

Semi-modular cabling and S2FC fan control

Fixed cables cover the 20+4 pin motherboard connector, while two 6+2 pin PCIe and six SATA connectors attach only when needed, reducing internal clutter and improving airflow. A 120 mm fluid dynamic bearing fan runs under Seasonic Smart and Silent Fan Control (S2FC), adjusting speed to system demand for quieter operation at low load.

Suited to mid-range builds.

This unit fits builders wanting Gold efficiency, compact dimensions and a 100,000 hour MTBF at 25 °C in a mainstream gaming or workstation PC. Systems requiring more than two PCIe power cables or significantly higher wattage should consider a larger capacity model.

Highlights

  • 650 W output powers demanding builds
  • 80 PLUS Gold certification cuts wasted energy
  • 140 mm depth fits every ATX case
  • semi-modular cabling reduces clutter for better airflow
  • 120 mm fluid dynamic bearing fan with smart silent control optimises noise

Specifications

BrandSeaSonic
SeriesFOCUS GM Series
ModelFOCUS GM-650 (SSR-650FM)
TypeIntel ATX 12 V
Maximum Power650 W
Fans120mm Fluid Dynamic Bearing Fan
Main Connector20+4Pin
+12V RailsSingle
PCI-Express Connector2 x 6+2-Pin
SATA Power Connector6
Max PSU Length140 mm
ModularSemi-Modular
Energy-Efficient80 PLUS GOLD Certified
Over Voltage ProtectionYes
Input Voltage100 - 240 V
Input Frequency Range50/60 Hz
Input Current9 - 4.5 A
Output+3.3V@20A, +5V@20A, +12V@54A, [email protected] , +5VSB@3A
MTBF100,000 hours MTBF @ 25 C, excl. fan
ApprovalscTUVus, TUV, CB, CCC, BSMI, EAC, RCM
ConnectorsPCIe connecotors x 4
Features80 PLUS Gold certified
Semi-Modular Cables
Compact Size - 140 mm deep
Tight Voltage Regulation
Cable-free Connection Design
S2FC - Smart and Silent Fan Control
DC to DC Converter Design
Multi-GPU setup
Gold plated connectors
7 years warranty
Dimensions5.91" x 5.51" x 3.39"
Weight3.77 lbs.
Shipping weight2.63 kg
Package size279 × 188 × 119 mm

Other versions of this model

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Questions about this item

Will the 120mm Fluid Dynamic Bearing fan need replacement before the 100000 hour MTBF rating?

The MTBF of 100000 hours at 25 C excludes the fan, so the fan may require replacement earlier depending on operating temperature and dust buildup.

What is the first limit reached when the +12V rail runs at 54A continuously?

The single +12V rail is rated for 54A, delivering the full 650W; sustained loads at this level will hit the rail's current limit before any other protection triggers.

How loud and hot does the S2FC fan control get during all-day operation?

The 120mm FDB fan uses S2FC to adjust speed to system needs, running quieter at low load and spinning faster under sustained 650W output to manage heat.

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