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Compact SFX power supply unit with 8cm fan and multiple connectors

Ruth's sister

Ruth's sister 300W SFX 3.21 internal power cable

SKU CH-YC7M-7WF6R

SFX 3.21 power supply delivers 300 W with passive PFC, 24-pin ATX, 4-pin CPU, two SATA and two IDE connectors in a 100×125×63.5 mm non-modular unit

  • 300 W rated power handles compact builds
  • 8 cm silent fan keeps temperatures low
  • Passive PFC with 74 % efficiency
  • Over-voltage, short-circuit and overload protection built in
  • SFX 3.21 form factor fits small chassis

Product identity

This 300W SFX power supply follows the Intel SFX12V 3.21 specification and delivers up to 400W peak output. It targets compact desktop builds and POS terminals that require a small-form-factor unit with a standard 24-pin motherboard connector and a 4-pin CPU power lead.

Installation notes

The non-modular cable loom includes one 24-pin, one 4-pin CPU, two SATA, two IDE and one small 4-pin connector, so routing is fixed once the unit is mounted. An 80 mm fan provides cooling; ensure the chassis SFX bay has clearance for the 125 mm depth and that airflow reaches the intake side.

Compatibility checklist

Verify that your motherboard uses a 24-pin ATX and a 4-pin CPU power socket, not an 8-pin EPS variant. Confirm the system draws no more than 300W continuous load and that the AC input range of 180-264V matches your local mains supply.

How it compares

Measured against everything we stock in Internal PSU & Riser Cables, at today’s prices. Recalculated every night.

Price $48.99
Pricier than about 82% of the 7,839 comparable items (median $14.99).

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Specifications

No published specifications for this item yet.

Questions about this item

How can I confirm the 300W SFX unit is operating correctly once installed?

The power-good signal should appear within 100-500 ms and the hold-up time must be at least 16 ms at full load.

Which connectors come attached to the non-modular cable set and what extra cables might I need?

Fixed cables include one 24-pin, one 4-pin CPU, two SATA, two IDE and one small 4-pin; any additional SATA or PCIe connectors require separate adapters.

Should I choose the 115 V or 220 V input setting for my region?

The unit has a manual voltage selector; set it to 115 V for 115 Vac mains or 220 V for 220 Vac mains before powering on.

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