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Rectangular black metal PSU with 120mm fan grill and modular cable sockets

Seasonic

Seasonic FOCUS GM-550 550W 80+ Gold Semi-Modular power supply

SKU CH-RJMW-C0TJG MPN FOCUS GM-550

Delivers 550 W through a single +12 V rail with 80 PLUS Gold efficiency in a 140 mm semi-modular chassis

  • Max wattage550 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 Gold (550W) Semi-Modular

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  • 80 PLUS Gold efficiency cuts wasted energy during conversion
  • 140 mm depth fits all ATX cases for easy installation
  • Semi-modular cabling keeps unused wires out of the airflow path
  • 120 mm fluid-dynamic-bearing fan runs under smart silent control for quiet operation
  • Single +12 V rail delivers 45 A for stable GPU power

Compact 140 mm ATX Power Supply

The Seasonic FOCUS GM-550 delivers 550 W through a single +12 V rail rated at 45 A. Its 140 mm depth fits every standard ATX chassis while the 80 PLUS Gold rating keeps conversion losses low. A 120 mm fluid-dynamic-bearing fan runs under smart speed control for quiet operation.

Semi-Modular Cabling and Straightforward

Fixed 20+4 pin ATX and 8-pin CPU cables are permanently attached; two PCIe 6+2 pin and six SATA leads detach to reduce clutter. Cable lengths of 610 mm, 650 mm and 750 mm reach full-size boards without strain. The only common snag is routing the stiff 24-pin loom behind tight motherboard trays.

Mid-Range Builds and Upgraders

This unit suits mainstream gaming PCs drawing up to 550 W from a single GPU and multiple drives. Builders planning dual high-end cards or extreme overclocks should look at higher-wattage models instead.

How it compares

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

Price $83.99
Cheaper than about 74% of the 10,869 comparable items (median $142.99).
Max wattage 550 W
Lower than about 82% of the 930 comparable items (median 850 W).

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Specifications

Product
Brand nameSeaSonic
Product lineFOCUS GM Series
Model nameFOCUS GM-550 (SSR-550FM)
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@45A, +5VSB@3A
Connection types1 x Main Power (24/20 pins)
1 x CPU (8/4 pins)
2 x PCIe (8/6 pins)
6 x SATA
3 x Peripheral
Power
Max wattage550 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 current8–4 A
Size & build
Product dimensions3.39 in × 5.91 in × 5.51 in
Product weight3.77 lb (1.71 kg)
Shipping weight2.43 kg
Package size277 × 185 × 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

How can I confirm the FOCUS GM-550 is delivering stable power after installation?

The 80 PLUS Gold certification means the unit meets strict efficiency targets at 20, 50 and 100 per cent load, and the single +12V rail rated at 45A provides consistent voltage to the GPU and CPU under heavy demand.

Which cables are permanently attached and which ones must be added from the modular set?

The 20+4 pin motherboard cable (610mm) and the 8/4+4 pin CPU cable (650mm) are fixed; the two PCIe 6+2 pin cables (750mm each), the SATA cables and the Molex cable are modular and can be left out if not needed.

Is the 550W capacity enough for a build with an RTX 30 or 40 Super card?

The supplier title lists RTX 30/40 Super compatibility; with a single +12V rail at 45A and two PCIe 6+2 pin connectors the unit can supply the 12V power those cards require, provided total system draw stays within 550W.

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