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Compact rectangular 300W power module with 24-pin ATX, SATA and AUX cables, green PCB and silver capacitors

myVolts

myVolts 300W Power Supply Module 12V DC Input ATX 24Pin SATA

SKU CH-HMC2-CST3R

Compact 300 W ATX module converts 12 V DC input to standard 24-pin, AUX and SATA power for mini-ITX and 1U systems

  • Product typeAT
  • 300 W output powers compact mini-ITX builds
  • 12 V DC input works with external adapters
  • Industrial solid capacitors handle 55 °C operation
  • Over-current and short-circuit protection guards components
  • 24-pin ATX, AUX and SATA cables included

Compact 12 V DC ATX module for mini-ITX builds

This 300 W power supply module accepts a 12 V DC input between 11.4 and 12.6 V and delivers up to 25 A on the input side. It is designed for mini-ITX and 1U chassis where an internal AC-DC unit would not fit. Industrial solid capacitors provide high temperature resistance and stable operation.

Requires external adapter and fits tight spaces

The board measures approximately 154 x 35 x 15 mm so it slides into small enclosures without blocking other components. A separate 12 V DC adapter must supply the input power; the module then distributes power through the included 24-pin ATX, AUX and SATA cables. No internal fan is present, freeing airflow for the rest of the system.

Passive cooling with 85 % efficiency

At 85 % power efficiency the module generates limited heat and operates silently without a fan. It is rated for ambient temperatures from 0 to 55 °C and humidity from 45 % to 75 % during use. Over-current and short-circuit protection shut the output down safely if a fault occurs.

How it compares

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

Price $42.99
Cheaper than about 92% of the 10,869 comparable items (median $142.99).

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Specifications

Product
Product typeAT

Questions about this item

Will the 300W limit be reached before the 12V input can sustain full load?

The module accepts 12V DC between 11.4 and 12.6V and draws up to 25A, delivering 300W at 85% efficiency; sustained loads above this will trigger over-current or short-circuit protection.

How hot does the board run when it powers a mining rig continuously?

Operating range is 0 to 55°C with 45% to 75% humidity; industrial solid capacitors provide high temperature resistance, but no fan is included so chassis airflow must remove the heat.

Which external 12V adapter do I need to have on hand before this module will turn on?

You must supply a 12V DC source capable of at least 25A (11.4-12.6V) with a compatible DC plug; the package includes the DC input cable but not the adapter itself.

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