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Black ATX power supply unit with 120mm cooling fan and standard cable bundle

E-POWER

E-POWER EP-550PM 550W ATX/EPS12V power supply 120mm fan

SKU CH-C4J8-4AKQM MPN EP-550PM

Delivers 550 W through a 120 mm fan-cooled ATX/EPS12V unit with 20+4 pin, 4+4 pin, two PCI-E 6+2 pin and six SATA connectors

  • Max wattage550 W
  • Power efficiency> 75%
  • Modular cablingNo
  • Fan configuration1
  • Main power connector20+4 Pin
  • 12V rails2
  • Delivers 550 W for stable system operation
  • 120 mm fan provides quiet cooling airflow
  • Dual +12 V rails balance load across components
  • Two PCI-E 6+2 pin connectors power modern graphics cards
  • Six SATA connectors support multiple storage drives

550W ATX/EPS12V supply for standard builds

The E-POWER EP-550PM delivers 550 W through dual +12 V rails and a 120 mm fan. It fits ATX and EPS12V systems that need a 20+4 pin main connector, a 4+4 pin CPU connector, two PCI-E 6+2 pin connectors, six SATA connectors, six Molex connectors and one FDD connector. The non-modular design keeps cabling simple for first-time builders.

Replaces older units below 550 W

Upgrading makes sense when a current supply cannot feed a mid-range graphics card or when a system restarts under load. The dual +12 V layout spreads current more evenly than many legacy single-rail units. Efficiency sits above 75 percent, so the jump is worth it for builds that run near the 550 W ceiling for extended periods.

Straightforward ATX installation with fixed cables

Mount the 150 x 140 x 86 mm chassis with four standard screws and connect the 24 pin, 4+4 pin and PCI-E leads directly. The fixed cable bundle cannot be reduced, so route unused Molex and FDD leads behind the motherboard tray. Verify that the 140 mm depth clears your case before fitting.

How it compares

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

Price $52.99
Cheaper than about 90% 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 nameePOWER
Product linePM
Model nameEP-550PM
Product colorBlack
Product typeATX 12 V / EPS 12 V
Ports & slots
PCIe power connectors2 × 6+2 Pin
SATA power connectors6
Connection types1 × 24 pin (20+4) ATX
12V power connector1 × 4+4 Pin ATX/EPS 12 V
Floppy connector1
Peripheral connector6
Power
Max wattage550 W
Power efficiency> 75%
Modular cablingNo
Main power connector20+4 Pin
12V rails2
Supply voltage115 / 230 V
AC input frequency50/60 Hz
Rated power550 W
Rated input current8A @ 115 V, 4A @ 230 V
+3.3V max. current24A
+5V max. current24A
+12V1 max. current20A
+12V2 max. current20A
-12V max. current0.5A
+5VSB max. current2.5A
Size & build
Product dimensions150 × 140 × 86 mm
Top fans size120 mm
Compatibility
PSU length limit140 mm
In the box
Fans total quantity1
More details
Fan configuration1

Questions about this item

Will the 140 mm length fit inside my case?

The unit measures 150 mm deep by 140 mm wide by 86 mm high. Check your case clearance for those dimensions before buying.

Does it provide enough PCIe power for a mid-range graphics card?

Two 6+2 pin PCIe connectors are included, each capable of delivering up to 150 W on the 12 V rails.

Is the main motherboard connector compatible with both 20 pin and 24 pin sockets?

Yes, the 20+4 pin design splits to fit either legacy 20 pin or modern 24 pin ATX headers.

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