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Black AT power supply unit with label showing compatible models

myVolts

myVolts PSU for FSP AT P8P9 300W Power Supply

SKU CH-AE2J-66ANS

AT form-factor power supply delivering 300 W for FSP SPI-300G, SPI-250G, SPI-200G, PS-7271 and SD-250AT units

  • Product typeAT
  • Compatible with FSP SPI-300G, SPI-250G and SPI-200G models
  • 300 W output powers AT systems reliably
  • Replaces PS-7271 and SD-250AT units directly
  • New condition ensures full service life ahead

Compatible AT power supply

This myVolts power supply replaces FSP AT units rated at 200 W, 250 W and 300 W. It fits models SPI-300G, SPI-250G, SPI-200G, PS-7271 and SD-250AT. The unit delivers standard AT voltages for legacy desktop and industrial systems. Builders maintaining older AT platforms can use it as a direct drop-in replacement.

Thermals noise and power draw

The supply operates at up to 300 W continuous output within the original AT specification. Cooling is handled by the internal fan design matched to the listed FSP chassis. Acoustic output remains consistent with the original power supplies it replaces. Power draw from the mains scales with the connected load up to the rated maximum.

How it compares

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

Price $226.99
Pricier than about 68% of the 10,869 comparable items (median $142.99).

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Specifications

Product
Product typeAT

Questions about this item

How do I connect the P8 and P9 connectors to the motherboard, and which step is often done incorrectly?

Align the keyed P8 and P9 plugs with the motherboard header and press both fully home until the latches click; the common error is seating only one side, leaving the other loose and causing intermittent power.

What maintenance will this 300 W AT unit need over time, and which parts are most likely to require replacement?

Clean the intake vents and fan blades every six to twelve months to prevent dust build-up; the internal electrolytic capacitors and the cooling fan are the components most likely to need replacement after extended use.

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