be quiet! · Power Supply Unit

be quiet! SFX POWER 3 450W price in United Kingdom

MPN BN321EAN 4260052188279

Noise33.8 dB
Weight890 g
ColourBlack
Total power450 W

Lowest price incl. delivery

£53.74

at PCHUB.UKFree deliveryIn stock

3 stores
Range £53.74 – £69.99
Save up to £16.25 vs. the dearest store
3 in stock
2 with free delivery
Checked 6 Oct 2026, 05:40 UTC

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Full specifications and side-by-side comparison

Prices in United Kingdom

3 stores · prices in GBP · updated 6 Oct 2026, 05:40 UTC

Lowest price£53.74at PCHUB.UK · free shippingGo to PCHUB.UK

Price range across 3 offers

Save up to £16.25 (23%) by choosing the cheapest store

3 of 3 stores in stock
2 with free shipping
Checked 6 Oct 2026, 05:40 UTC

PCHUB.UKLowest pricebe quiet! SFX POWER 3 450W power supply unit 20+4 pin ATX Black In stockFree shipping
£53.74incl. free shipping
Go to store : PCHUB.UK (opens in a new tab)
Back to the Officebe quiet! SFX POWER 3 450W power supply unit 20+4 pin ATX Black In stockFree shipping
£69.99incl. free shipping+£16.25 (30%) vs lowest
Go to store : Back to the Office (opens in a new tab)
PcNova.co.ukbe quiet! SFX POWER 3 450W power supply unit 20+4 pin ATX Black In stockShipping not stated
£53.74item price, shipping extra
Go to store : PcNova.co.uk (opens in a new tab)

Ad: we may earn a commission when you buy through these links; it never changes the order, which is by total price only. Prices and stock are shown as each store states them, as of 6 Oct 2026, 05:40 UTC, and can change at any time. Taxes are included only where the store includes them.

Price history in United Kingdom

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Best price · PCHUB.UK£53.74

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Product details

Identification

Brand: be quiet!
Product: SFX POWER 3 450W
Full name: be quiet! SFX POWER 3 450W power supply unit 20+4 pin ATX Black
Manufacturer part number: BN321
EAN / UPC: 4260052188279
Category: Power Supply Unit

66 specifications from the manufacturer's data sheet

Power

Total power	450 W
Peak power	500 W
AC input voltage	100 - 240 V
AC input frequency	50 - 60 Hz
Input current	6/2.5 A
Maximum input current (@110V)	6 A
Maximum input current (@220V)	2.5 A
Power factor	0.98
Power Factor Correction (PFC) type	Active
Combined power (+3.3V)	85 W
Combined power (+12V)	450 W
Combined power (+5V)	85 W
Max output current (+3.3V)	16 A
Max output current (+12V1)	37.5 A
Max output current (+5V)	16 A
Max output current (-12V)	0.3 A
Max output current (+5Vsb)	2.5 A
Efficiency	85.9%
Hold time	21 ms
Power protection features	Over current, Over power, Over voltage, Short circuit, Under voltage

Ports & interfaces

Motherboard power connector	20+4 pin ATX
Motherboard power cable length	35 cm
Number of SATA power connectors	3
SATA power cable length	300,450,600 mm
Peripheral (Molex) power connectors (4-pin)	2
Peripheral (Molex) power cable length	300,450 mm
EPS power connector (4+4 pin)	Yes
PCI Express power connectors (6+2 pin)	2
PCI Express power cable length	55 cm
Floppy disk drive cable length	60 cm
Floppy drive power connector	1
PCI Express connector	Yes
Cabling type	Non-Modular

Performance

Purpose	PC
Power supply unit (PSU) form factor	SFX
80 PLUS certification	80 PLUS Bronze
ATX version	3.42
EPS version	2.92
Noise level	33.8 dB
Bearing technology	Rifle
Mean time between failures (MTBF)	100000 h

Design

Product colour	Black
Cooling type	Active
Fan diameter	8 cm
Number of fans	1 fan(s)
Illumination	No
On/off switch	Yes

Certificates

Compliance certificates	RoHS, WEEE

Safety regulation & standards

Safety	CE, CB, TÜV, CU

Weight & dimensions

Width	125 mm
Depth	100 mm
Height	64 mm
Weight	890 g

Packaging data

Package width	197 mm
Package depth	75 mm
Package height	207 mm
Package weight	1.24 kg
Package type	Box

Technical details

Sustainability certificates	ENERGY STAR, ErP
Sustainability compliance	Yes

Logistics data

Products per shipping (inner) case	6 pc(s)
Shipping (inner) case gross weight	8.19 kg
Shipping (inner) case height	23.3 cm
Shipping (inner) case length	45.7 cm
Shipping (inner) case width	26.5 cm
Harmonized System (HS) code	84733020