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Compact SFX power supply unit with matte black finish and modular cable ports

EVGA

EVGA SuperNOVA 550 GM SFX Power Supply 123-GM-0550-Y1

SKU CH-AZEC-D3WVQ MPN 123-GM-0550-Y1

An SFX power supply delivering 550 W with 80 Plus Gold efficiency, fully modular cables, a 92 mm double ball bearing fan, and 100 % Japanese capacitors

  • Max wattage550 W
  • Power efficiency90% (115 VAC) or Higher Typical
  • Modular cablingFull Modular
  • Fan configuration1 × 92 mm Double Ball Bearing Fan
  • Main power connector24Pin
  • 12V railsSingle

Model SFX 80+ Gold (550W)

  • 80 Plus Gold certification delivers 90% typical efficiency reducing wasted energy
  • Fully modular cabling keeps builds tidy and airflow unobstructed
  • SFX form factor with ATX bracket fits compact and standard cases
  • 100% Japanese capacitors and DC-to-DC design ensure stable long-term output
  • ECO mode with double ball bearing fan runs quietly under light loads

SFX 550 W Power Supply

The EVGA SuperNOVA 550 GM is an SFX-form-factor power supply rated for 550 W continuous output. It carries 80 Plus Gold certification and uses a fully modular cable set. The unit includes an ATX mounting bracket for broader case compatibility. It targets builders who need high efficiency in a compact chassis.

Sustained Load Behaviour

A single +12 V rail delivers up to 45.8 A with DC-to-DC conversion for the 3.3 V and 5 V rails. 80 Plus Gold rating means typical efficiency reaches 90 % at 115 VAC, limiting waste heat during extended operation. The 92 mm double ball bearing fan runs in ECO mode until thermal thresholds require active cooling. Over-voltage, over-current, over-temperature, over-power, short-circuit and under-voltage protections guard components under heavy demand.

Installation and Common Issues

Full modularity lets you connect only the cables required, reducing clutter in tight SFX layouts. The package supplies four 8-pin PCIe connectors, four SATA power connectors and a 24-pin ATX connector. A Power ON Self Tester is included for basic rail verification before system assembly. The 100 mm depth fits standard SFX bays, though cable routing space varies by case design.

How it compares

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

Price $77.99
Cheaper than about 76% 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 nameEVGA
Product lineSuperNOVA 550 GM
Model name123-GM-0550-Y1
Product typeSFX
Ports & slots
PCIe power connectors4 × 8pin (6+2)
SATA power connectors4
Output type+3.3 V @ 20A, +5 V @ 20A, +12 V @ 45.8A, +5VSB @ 2.5A, -12 V @ 0.3A
Connection types1 × 24 Pin ATX
1 × 8 Pin (4+4) EPS (CPU)
4 × 8 Pin (6+2) PCIE
4 x SATA
4 × 4-Pin Peripheral
1 x Floppy
Power
Max wattage550 W
Power efficiency90% (115 VAC) or Higher Typical
Modular cablingFull Modular
Main power connector24Pin
12V railsSingle
Efficiency certification80 PLUS GOLD Certified
Overvoltage protectionYes
Supply voltage100–240 V
AC input frequency50/60 Hz
Rated input current7.5–4A
Size & build
Product dimensions2.48 in × 4.92 in × 3.94 in
Product weight3.3 lb (1.5 kg)
Shipping weight1.84 kg
Package size277 × 201 × 99 mm
Compatibility
Haswell compatibilityCertified
PSU length limit100 mm
Environment & compliance
Regulatory approvalsTUV, CB, CE, FCC, cTUVus, WEEE, RoHS Compliance with ErP Lot 6 2013 Requirement
More details
Fan configuration1 × 92 mm Double Ball Bearing Fan
Mean time between failures100,000 h

Other versions of this model

1 more in the same range

Questions about this item

How loud does the 92 mm double ball bearing fan get when the 550 W unit runs all day?

The fan uses ECO mode so it stays off at low load and spins only when temperature demands it, keeping noise low during typical daily operation.

What cables or connectors must I already have to install this fully modular SFX supply?

No cables are permanently attached; the box includes every modular cable you need — 24-pin ATX, four 8-pin (6+2) PCIe and four SATA — plus an SFX-to-ATX mounting bracket.

Will the single +12 V rail rated at 45.8 A work with my older Haswell-era motherboard and drives?

Yes, the unit is Haswell certified and the single +12 V rail delivers up to 45.8 A, so it powers legacy 3.3 V, 5 V and 12 V components without compatibility issues.

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