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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

  • TypeSFX
  • Maximum Power550 W
  • Fans1 x 92mm Double Ball Bearing Fan
  • Main Connector24Pin
  • +12V RailsSingle
  • PCI-Express Connector4 x 8pin (6+2)

Options 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.

Highlights

  • 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

Specifications

BrandEVGA
SeriesSuperNOVA 550 GM
Model123-GM-0550-Y1
TypeSFX
Maximum Power550 W
Fans1 x 92mm Double Ball Bearing Fan
Main Connector24Pin
+12V RailsSingle
PCI-Express Connector4 x 8pin (6+2)
SATA Power Connector4
Haswell SupportCertified
Max PSU Length100 mm
ModularFull Modular
Efficiency90% (115 VAC) or Higher Typical
Energy-Efficient80 PLUS GOLD Certified
Over Voltage ProtectionYes
Input Voltage100 - 240 V
Input Frequency Range50/60 Hz
Input Current7.5 - 4A
Output+3.3V @ 20A, +5V @ 20A, +12V @ 45.8A, +5VSB @ 2.5A, -12V @ 0.3A
MTBF100,000 Hours
ApprovalsTUV, CB, CE, FCC, cTUVus, WEEE, RoHS Compliance with ErP Lot 6 2013 Requirement
Connectors1 x 24 Pin ATX
1 x 8 Pin (4+4) EPS (CPU)
4 x 8 Pin (6+2) PCIE
4 x SATA
4 x 4-Pin Peripheral
1 x Floppy
Features100% Japanese Capacitors ensure long-term reliability
80 PLUS Gold certified, with 90% (115 VAC) / 92% (220 VAC to 240 VAC) efficiency or higher under typical loads
Fully Modular to reduce clutter and improve airflow
Heavy-duty protections, including OVP (Over Voltage Protection), UVP (Under Voltage Protection), OCP (Over Current Protection), OPP (Over Power Protection), SCP (Short Circuit Protection), and OTP (Over Temperature Protection)
Double Ball Bearing fan for exceptional reliability and quiet operation
SFX-Standard Form Factor packs large power into a small space for compatib
Dimensions2.48" x 4.92" x 3.94"
Weight3.30 lbs.
Shipping weight1.84 kg
Package size277 × 201 × 99 mm

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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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