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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

  • Max wattage650 W
  • Modular cablingSemi-Modular
  • Fan configuration120 mm Fluid Dynamic Bearing Fan
  • Main power connector20+4Pin
  • 12V railsSingle
  • PCIe power connectors2 × 6+2-Pin

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

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  • 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.

How it compares

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

Price $100.99
Cheaper than about 67% of the 10,869 comparable items (median $142.99).
Max wattage 650 W
Lower than about 70% of the 930 comparable items (median 850 W).

New to this? Buying PC parts with Monero — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameSeaSonic
Product lineFOCUS GM Series
Model nameFOCUS GM-650 (SSR-650FM)
Product typeIntel ATX 12 V
Ports & slots
PCIe power connectors2 × 6+2-Pin
SATA power connectors6
Output type+3.3 V@20A, +5 V@20A, +12 V@54A, +5VSB@3A
Connection typesPCIe connecotors x 4
Power
Max wattage650 W
Modular cablingSemi-Modular
Main power connector20+4Pin
12V railsSingle
Efficiency certification80 PLUS GOLD Certified
Overvoltage protectionYes
Supply voltage100–240 V
AC input frequency50/60 Hz
Rated input current9–4.5 A
Size & build
Product dimensions5.91 in × 5.51 in × 3.39 in
Product weight3.77 lb (1.71 kg)
Shipping weight2.63 kg
Package size279 × 188 × 119 mm
Compatibility
PSU length limit140 mm
Environment & compliance
Regulatory approvalscTUVus, TUV, CB, CCC, BSMI, EAC, RCM
More details
Fan configuration120 mm Fluid Dynamic Bearing Fan
Mean time between failures100,000 h MTBF @ 25 C, excl. fan

Other versions of this model

5 more in the same range

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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