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Silver metal Flex ATX server PSU with 40mm exhaust fan and cable bundle

Athena Power

Athena Power AP-MFATX50P8 500W Flex ATX server power supply

SKU CH-9EDD-2RG1P MPN AP-MFATX50P8

500W Flex ATX server power supply with 80PLUS Silver efficiency, dual 12V rails, two PCIe 6+2 connectors and 100,000-hour MTBF

  • Max wattage500 W
  • Fan configuration40 mm Exhaust x 1
  • Main power connectorATX 24 (20+4) Pin x 1 P4-12 V 4+4 Pin x 1 EPS12 V 8 Pin x 1
  • Output type+3.3 V@18A +5 V@18A +12V1@20A +12V2@20A
  • Supply voltage88–264 V
  • AC input frequency50/60 Hz

Wattage 500W

  • 500W output powers dense server builds
  • 80PLUS Silver efficiency lowers running costs
  • Flex ATX form factor fits compact chassis
  • 100,000-hour MTBF supports continuous operation
  • Dual 12V rails with PCIe connectors drive GPU workloads

Flex ATX 500W server power supply

The Athena Power AP-MFATX50P8 delivers 500 watts in a Flex ATX form factor designed for GPU servers and compact rackmount builds. It provides dual +12V rails rated at 20A each alongside +3.3V and +5V rails at 18A. A single 40mm exhaust fan handles cooling while the unit carries 80PLUS Silver certification for efficient operation.

Check chassis clearance and connector needs

Verify that your case accepts a Flex ATX unit measuring 1.59" high, 3.20" wide and 6.00" long. Ensure the motherboard requires an ATX 24-pin main connector plus an EPS12V 8-pin and a P4-12V 4+4-pin for CPU power. Confirm the GPU power demand matches two PCIe 6+2-pin leads and that three SATA and two Molex connectors cover your drives.

Compact metal housing with rear exhaust

The steel enclosure weighs 3.50 lbs and fits tight server bays without protruding. A rear-facing 40mm fan pulls heat straight out the back, keeping airflow linear in dense configurations. Fixed cables exit the housing in a single bundle, so plan routing space behind the motherboard tray. Operating temperature range spans 0°C to 50°C at full load with a 100,000-hour MTBF at 25°C.

How it compares

Measured against everything we stock in Server & Hot-Plug PSUs, at today’s prices. Recalculated every night.

Price $139.99
Typical for this category: the median of 3,798 items is $131.99.
Max wattage 500 W
Lower than about 60% of the 235 comparable items (median 668 W).

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Specifications

Product
Brand nameAthena Power
Model nameAP-MFATX50P8
Product typeFlex ATX
Ports & slots
Output type+3.3 V@18A
+5 V@18A
+12V1@20A
+12V2@20A
Power
Max wattage500 W
Main power connectorATX 24 (20+4) Pin x 1
P4-12 V 4+4 Pin x 1
EPS12 V 8 Pin x 1
PCIE 6+2 Pin x 2
SATA 15 Pin x 3
Molex 4 Pin x 2
Supply voltage88–264 V
AC input frequency50/60 Hz
Power hold-up time17 ms min.
Size & build
Product dimensions1.59 in × 3.2 in × 6 in (H × W × L)
Product weight3.5 lb (1.59 kg)
Shipping weight1.05 kg
Package size218 × 147 × 64 mm
Environment & compliance
Temperature rangeOperating: 0 degree C ~ +50 degree C on Full Load;
Storage & Shipping: -20 degree C ~ +80 degree C
More details
Fan configuration40 mm Exhaust x 1
Mean time between failures100,000 h on Maximum Load at +25 degree C

Other versions of this model

1 more in the same range

Questions about this item

Does the Athena Power AP-MFATX50P8 include all cables needed for a typical GPU server build or must I buy extra leads?

The unit ships with a 24-pin ATX, an EPS 8-pin, two PCIe 6+2-pin, three SATA and two Molex connectors already attached; no additional cables are required for standard installations.

Should I choose this 500 W Flex ATX model or a lower-wattage unit for a dual-CPU server with one graphics card?

The 500 W rating and dual +12 V rails at 20 A each give enough headroom for dual CPUs plus a GPU that draws power through the two PCIe leads.

What does the 500 W 80PLUS Silver rating mean when the supply is running at full load in a 50 °C chassis?

At 100 % load the supply still meets Silver efficiency, the 40 mm exhaust fan maintains airflow, and the MTBF of 100,000 hours is rated at 25 °C ambient.

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