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be quiet! TFX Power 3 300W Gold Power Supply, TFX Form Factor, 80 PLUS Gold, 80mm Quiet Fan, for Slim and Small Form Factor PCs

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be quiet!
be quiet! TFX Power 3 300W Gold TFX Power Supply
be quiet! TFX Power 3 300W Gold Power Supply, TFX Form Factor, 80 PLUS Gold, 80mm Quiet Fan, for Slim and Small Form Factor PCs
€93.95 inc. VAT
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BN323
€78.95 €87.72
€93.95 inc. VAT
Ships from EU stock: 6 item(s)
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Product Code
04:371552
EAN Code
4260052188293
Manufacturer
be quiet!

Quick Specs

Type
TFX PC power supply
Connectors/Interface
20+4-pin · P4 · PCIe 6+2 · 3× SATA
Key spec
300 W · 80 PLUS Gold
Compatibility
TFX slim / SFF cases
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be quiet! TFX Power 3 300W Gold — TFX Power Supply

300 W (350 W peak)80 PLUS GoldTFX form factor80 mm quiet fan

The be quiet! TFX Power 3 300W Gold is a TFX form-factor power supply with 80 PLUS Gold certification, made for slim desktops and small form factor office PCs that need a quiet, efficient replacement or upgrade unit.

It delivers 300 W continuous and 350 W peak, with up to 91.7% efficiency at 50% load on 230 V. The 80 mm rifle-bearing fan runs at 9.1–21.7 dB(A), so the PC stays quiet in offices, reception desks and living rooms.

Before you order: TFX power supplies only fit cases built for TFX units (175 × 85 × 65 mm). The unit has a 4-pin CPU connector only: motherboards that require an 8-pin EPS CPU connector will not work.

What's in the Box

  • 1 × be quiet! TFX Power 3 300W Gold power supply
  • Mounting screws
  • Cable ties
  • User manual

What It Means in Practice

  • A drop-in replacement for the original TFX unit in many slim business PCs and HTPC cases.
  • One 6+2-pin PCIe connector can power an entry-level graphics card that needs auxiliary power.
  • Three SATA and two Molex connectors cover SSDs, a hard drive and an optical drive.
  • Cables up to 60 cm long, with 35 cm to the motherboard connector — check routing in very compact cases.

What Will Not Work

  • Standard ATX, SFX or Flex ATX cases: wrong form factor.
  • Motherboards that require an 8-pin EPS CPU power connector.
  • Graphics cards that need two PCIe power connectors or more than about 150 W.
  • Modular cable swaps: all five cables are fixed.

Key Features

 
80 PLUS Gold
Up to 91.7% efficiency at 50% load (230 V) for less heat in a cramped case.
 
Quiet 80 mm fan
Rifle-bearing fan at 9.1–21.7 dB(A), max 1323 rpm.
 
Dual +12 V rails
2 × 13 A (288 W combined) with active clamp topology for stable voltages.
 
Full protection
OCP, OPP, SCP, OVP, UVP and SIP protect the PC and the supply.

Technical Specifications

Identification
Part Number BN323
EAN / GTIN 4260052188293
Model TFX Power 3 300W Gold
Brand be quiet!
Electrical
Output power 300 W continuous, 350 W peak
Standard TFX12V 2.52, EPS12V 2.92
Efficiency 80 PLUS Gold, 91.7% at 50% load (230 V)
AC input 100–240 V, 50–60 Hz, 4 A / 2 A
Power factor >0.98
+3.3 V / +5 V 18 A / 18 A (combined 103 W)
+12 V 12V1 13 A, 12V2 13 A (combined 288 W)
−12 V / +5 VSB 0.3 A / 3 A
Protections OCP, OPP, SCP, OVP, UVP, SIP
Connectors
ATX 1 × 20+4-pin
CPU 1 × P4 (4-pin)
PCIe 1 × 6+2-pin
SATA 3
Molex (4-pin) 2
Floppy 1
Cable length Up to 60 cm; 35 cm to motherboard
Cabling Non-modular
Physical
Form factor TFX
Fan 80 mm rifle bearing, 9.1–21.7 dB(A)
Dimensions 175 × 85 × 65 mm
Weight 1.1 kg
Lifetime 100,000 h at 25 °C
Operating temperature Up to 40 °C
Colour Black
Warranty
Warranty 1-Year Warranty (Singular)
Manufacturer Term 3 years per be quiet! — claims handled through Singular

Frequently Asked Questions

Will it fit my slim office PC?
If the current supply is a TFX unit (about 175 × 85 × 65 mm), very likely yes. Check the CPU connector on the motherboard: it must be 4-pin, not 8-pin only.
Can it power a graphics card?
Yes, an entry-level card that needs one 6-pin or 8-pin PCIe connector, as long as the total system load stays within 300 W.
Is it really quiet?
be quiet! rates the fan at 9.1–21.7 dB(A). In typical office use it runs near the lower end.
Singular Expert Insight · Buyer's Guide
Replacing a failed or noisy TFX supply in a business PC is the most common use for this unit, and the Gold efficiency helps in cases with little airflow. Measure the old unit first: TFX, SFX and Flex ATX look similar but do not interchange. Other options are in our power supplies up to 430W.
✓ Buy it if your slim or small form factor PC uses a TFX power supply and you want a quiet, efficient replacement.
✕ Skip it if your PC uses ATX, SFX or Flex ATX, or the motherboard needs an 8-pin CPU connector.
→ Also consider a higher-wattage ATX unit if you are moving the build to a standard case.
Not sure it fits? Send us the PC model or a photo of the old power supply label and we will check before you order.

Features - be quiet! - BN323

Colour
black
More Details
Product Code
04:371552
EAN Code
4260052188293
Manufacturer
be quiet!
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