be quiet! TFX Power 3 300W PSU

be quiet! TFX Power 3 300W Gold | Compact PSU for Small Builds

The be quiet! TFX Power 3 300W Gold power supply unit 20+4 pin ATX Black delivers efficient, silent power in a compact TFX form factor. Designed for mini-ITX and media centre PCs, it supports modern components including PCIe graphics cards while maintaining whisper-quiet operation. The 80 PLUS Gold certification ensures high efficiency, reducing heat and energy waste in space-constrained builds.

Key Specifications

Efficient Cooling for Silent Operation

The 80mm rifle-bearing fan delivers effective cooling without excessive noise. With a speed range of 0-1323 RPM and intelligent fan control, the PSU remains virtually silent under light loads. This makes it ideal for media PCs or home theatre systems where acoustic performance matters as much as reliability.

Compact Design Without Compromise

Measuring just 85mm x 175mm x 65mm, this PSU fits where standard ATX units cannot. The non-modular cabling keeps costs down while providing all necessary connections including 20+4 pin ATX, PCIe 6+2 pin, and multiple SATA/Molex connectors. Despite the compact size, it delivers solid 12V rail performance with 288W combined output across two rails.

Built-In Protection for Component Safety

Comprehensive power protection features safeguard your system from electrical damage. Over current, over power, over voltage, short circuit, surge & inrush protection (SIP), and under voltage protection work together to prevent component failure. The 29ms hold-up time ensures stable operation during brief power fluctuations.

Box Contents

• be quiet! TFX Power 3 300W Gold PSU
• Mounting screws
• Cable ties
• User manual (German, English, Spanish, French, Polish, Russian)

Check Before You Buy

• Confirm your case supports TFX form factor (85mm x 175mm x 65mm)
• Verify your GPU’s power requirements don’t exceed 300W total
• Check available PCIe power connector compatibility (6+2 pin)
• Ensure adequate ventilation for the compact PSU design

Frequently Asked Questions

Q: Is this PSU compatible with standard ATX cases?

A: No, this is a TFX form factor unit designed for specific small form factor cases. Standard ATX cases require full-size ATX PSUs.

Q: Can it power a dedicated graphics card?

A: Yes, it includes a PCIe 6+2 pin connector and provides 288W on the 12V rails, suitable for entry-level to mid-range graphics cards.

Q: What does 80 PLUS Gold certification mean?

A: It indicates 90.6% efficiency at typical loads, meaning less energy wasted as heat and lower electricity bills compared to lower-rated units.

Q: Is the fan always running?

A: No, the intelligent fan control allows the fan to stop under light loads, activating only when cooling is needed for silent operation.

The Consultant’s Verdict & Warranty

The be quiet! TFX Power 3 300W Gold power supply unit 20+4 pin ATX Black represents excellent value for small form factor PC builders prioritising silence and efficiency. Its compact dimensions, comprehensive protection, and Gold efficiency rating make it perfect for media PCs, home theatre systems, and compact gaming rigs with modest power requirements. Covered by the standard Manufacturer Warranty.