be quiet! TFX POWER 3 300W PSU Black
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About This Item
- 8 cm fan with active cooling for quiet operation
- 80 PLUS Gold certification for high energy efficiency
- 300 W total power with 350 W peak capability
- Non-modular cabling with multiple connector options
- TFX form factor ideal for compact PC builds
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be quiet! TFX POWER 3 300W Gold | Compact High-Efficiency PSU
The be quiet! TFX POWER 3 300W Gold power supply unit 20+4 pin ATX Black delivers reliable, efficient power in a compact TFX form factor, making it ideal for mini-ITX and media centre PCs. With 80 PLUS Gold certification and quiet operation, it supports PCIe graphics cards while maintaining solid voltage regulation and low noise levels.
Slim Specs Table
| Metric | Spec |
|---|---|
| Power Output | 300W |
| Efficiency | 80 PLUS Gold |
| Form Factor | TFX |
| Noise Level | 21.7 dB |
| MTBF | 100,000 hours |
Quiet Operation for Compact Builds
The TFX POWER 3 300W Gold features a single 80mm fan with active cooling that operates at just 21. 7 dB, making it one of the quietest options for small form factor systems. The intelligent fan curve ensures cooling only when needed, reducing noise during light workloads and media playback.
Reliable Power Delivery for Graphics Cards
With a combined +12V output of 288W and a dedicated 6+2 pin PCIe connector, this PSU can handle entry-level dedicated graphics cards. The active Power Factor Correction (PFC) maintains a power factor of 0. 98, ensuring stable voltage delivery even under load fluctuations.
Built-In Protection for System Safety
Comprehensive protection features include over current, over power, over voltage, short circuit, and under voltage protection. These safeguards work together to protect your components from electrical damage, while the 29ms hold-up time ensures stable operation during brief power interruptions.
Check before you buy
- Confirm your case supports TFX (85mm x 175mm x 65mm) form factor
- Verify your graphics card’s power requirements don’t exceed 288W +12V capacity
- Check that your motherboard uses standard 20+4 pin ATX connector
- Confirm you need non-modular cabling for your build
Box contents
- be quiet! TFX POWER 3 300W Gold power supply unit
- Power cables (non-modular)
- Mounting screws
- User manual
Frequently Asked Questions
Q: Can this power supply run a gaming PC?
A: This 300W PSU is designed for compact builds and can support entry-level graphics cards, but is not suitable for high-end gaming systems.
Q: Is this power supply modular?
A: No, the TFX POWER 3 uses non-modular cabling, which means all cables are permanently attached.
Q: What efficiency rating does this PSU have?
A: It has 80 PLUS Gold certification with 90. 6% efficiency at typical loads.
Q: Does this come with all necessary cables?
A: Yes, it includes all standard power cables for TFX systems including ATX, PCIe, SATA, and peripheral connectors.
Q: What are the dimensions of this power supply?
A: The TFX POWER 3 measures 85mm x 175mm x 65mm, making it suitable for compact PC cases.
The Consultant’s verdict & warranty
The be quiet! TFX POWER 3 300W Gold power supply unit 20+4 pin ATX Black is an excellent choice for compact PC builds requiring reliable, efficient power with quiet operation. Its 80 PLUS Gold certification and comprehensive protection features make it suitable for media centres and small form factor systems. Covered by the standard Manufacturer Warranty.
| Cooling | |
|---|---|
| Fan diameter | 8 cm |
| Number of fans | 1 fan(s) |
| Cooling type | Active |
| Design | |
| 80 PLUS certification | 80 PLUS Gold |
| Safety | CE, CB, TÜV, CU |
| Product colour | Black |
| Fan diameter | 8 cm |
| Number of fans | 1 fan(s) |
| Cooling type | Active |
| Power | |
| Total power | 300 W |
| Maximum input current (@220V) | 2 A |
| Peak power | 350 W |
| AC input voltage | 100 - 240 V |
| AC input frequency | 50 - 60 Hz |
| Input current | 4/2 A |
| Power factor | 0.98 |
| Power Factor Correction (PFC) type | Active |
| Maximum input current (@110V) | 4 A |
| Combined power (+3.3V) | 103 W |
| Combined power (+12V) | 288 W |
| Combined power (+5V) | 103 W |
| Max output current (+3.3V) | 18 A |
| Max output current (+12V1) | 13 A |
| Max output current (+12V2) | 13 A |
| Max output current (+5V) | 18 A |
| Max output current (-12V) | 0.3 A |
| Max output current (+5Vsb) | 3 A |
| Power protection features | Over current, Over power, Over voltage, Short circuit, Under voltage |
| Hold time | 29 ms |
| Efficiency | 90.6% |
| Ports & interfaces | |
| Motherboard power cable length | 35 cm |
| SATA power cable length | 300,450,600 mm |
| Peripheral (Molex) power cable length | 300,450 mm |
| PCI Express power cable length | 40 cm |
| CPU power cable length | 35 cm |
| Floppy disk drive cable length | 60 cm |
| Motherboard power connector | 20+4 pin ATX |
| Number of SATA power connectors | 3 |
| Peripheral (Molex) power connectors (4-pin) | 2 |
| PCI Express power connectors (6+2 pin) | 1 |
| CPU P4 connector (4-pin) | 1 |
| Floppy drive power connector | 1 |
| Cabling type | Non-Modular |
| Performance | |
| Power supply unit (PSU) form factor | TFX |
| 80 PLUS certification | 80 PLUS Gold |
| Purpose | PC |
| ATX version | 2.52 |
| EPS version | 2.92 |
| Safety | CE, CB, TÜV, CU |
| Noise level | 21.7 dB |
| Mean time between failures (MTBF) | 100000 h |
| Harmonized System (HS) code | 84733020 |
| Technical details | |
| Shipping (inner) case width | 27.5 cm |
| Shipping (inner) case length | 47.4 cm |
| Shipping (inner) case height | 19.5 cm |
| Products per shipping (inner) case | 6 pc(s) |
| Sustainability compliance | Yes |
| Sustainability certificates | ENERGY STAR, ErP |
| Compliance certificates | RoHS, WEEE |
| Certificates | |
| Compliance certificates | RoHS, WEEE |
| 80 PLUS certification | 80 PLUS Gold |
| Safety | CE, CB, TÜV, CU |
| Safety regulation & standards | |
| Safety | CE, CB, TÜV, CU |
| Weight & dimensions | |
| Width | 85 mm |
| Depth | 175 mm |
| Height | 65 mm |
| Weight | 1.1 kg |
| Packaging data | |
| Package depth | 80 mm |
| Package width | 159 mm |
| Package height | 215 mm |
| Package type | Box |
| Package weight | 1.43 kg |
| Logistics data | |
| Harmonized System (HS) code | 84733020 |
| Shipping (inner) case width | 27.5 cm |
| Shipping (inner) case length | 47.4 cm |
| Shipping (inner) case height | 19.5 cm |
| Products per shipping (inner) case | 6 pc(s) |
| Shipping (inner) case gross weight | 9.39 kg |
| Other features | |
| Harmonized System (HS) code | 84733020 |
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