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Silver rectangular Flex ATX power supply with single fan and 20+4 pin connector visible

Athena Power

Athena Power AP-MFATX40P8 400W Flex ATX server power supply

SKU CH-BPWQ-6ERPE MPN AP-MFATX40P8

Flex ATX 400 W unit with 80+ Bronze efficiency for 1U and Mini-ITX builds

  • Max wattage400 W
  • Power supply redundancySingle
  • Main power connector20+4Pin
  • Output current+5 V@15A, +12V1@16A, -12V2@16A, +3.3 V@15A
  • Supply voltage88/264 V AC
  • AC input frequency50/60 Hz

Wattage 400W

  • 400W output powers compact 1U servers reliably
  • 80 PLUS Bronze efficiency reduces heat and noise
  • Flex ATX form factor fits Mini-ITX chassis
  • Dual +12V rails at 16A each ensure stable delivery
  • 100,000-hour MTBF at 25°C signals long service life

Flex ATX 400 W server supply

The Athena Power AP-MFATX40P8 is a single 400 W Flex ATX power supply built for 1U rackmounts and Mini-ITX chassis. It carries 80 PLUS Bronze certification and active PFC, delivering up to 400 W across dual +12 V rails rated at 16 A each. A 40 mm fan with smart auto-speed control handles cooling.

Suits compact servers

Installers fitting a 1U or Mini-ITX build that requires PCIe power connectors and an EPS12V 8-pin will find the connectors and form factor matched. Builders who need redundant supplies or higher total wattage for multi-GPU configurations should look at other form factors.

Dual 16 A +12 V rails with two PCIe 6-pin connectors

The two +12V rails each provide 16 A, and the unit includes two PCIe 6-pin connectors for add-in cards. This rail layout and connector set determine whether the supply can support the intended graphics or compute cards.

How it compares

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

Price $78.99
Cheaper than about 77% of the 3,798 comparable items (median $131.99).
Max wattage 400 W
Lower than about 70% of the 235 comparable items (median 668 W).

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Specifications

Product
Brand nameAthena Power
Model nameAP-MFATX40P8
Product typeFlex ATX
Power
Max wattage400 W
Power supply redundancySingle
Main power connector20+4Pin
Output current+5 V@15A, +12V1@16A, -12V2@16A, +3.3 V@15A
Supply voltage88/264 V AC
AC input frequency50/60 Hz
Size & build
Product dimensions3.2 in × 1.7 in × 6 in
Product weight2 lb (0.91 kg)
Shipping weight1.21 kg
Package size251 × 160 × 79 mm
More details
Fan configuration1
Mean time between failures100,000 h on Maximum Load at 25 °C

Other versions of this model

1 more in the same range

Questions about this item

Will the 3.2" x 1.7" x 6" Flex ATX chassis fit my 1U rackmount or Mini-ITX case?

Yes, the 3.2" x 1.7" x 6" Flex ATX form factor is designed for 1U rackmounts and Mini-ITX chassis, matching the standard mounting holes and clearance for those enclosures.

Which power cables must be connected to the motherboard for the 20+4-pin ATX and 8-pin EPS12V connectors?

Connect the 24-pin ATX cable to the main board socket and the 8-pin EPS12V cable to the CPU power header; the 4+4-pin EPS split lets you use either 4-pin or 8-pin motherboard sockets.

When should the single 80 mm fan be cleaned or the unit replaced given the 100,000-hour MTBF rating?

Clean the fan intake every 6–12 months to maintain airflow; the 100,000-hour MTBF at 25 °C indicates the unit should run for many years before a full replacement is needed.

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