Product comparison · 2 power supply units

be quiet! SFX L vs be quiet! System Power B9

41specifications compared
28differ
13identical
25known for one product only

Key differences

Total power
- SFX L:500 W
- System Power B9:300 W
AC input voltage
- SFX L:100 - 240 V
- System Power B9:200 - 240 V
AC input frequency
- SFX L:50 - 60 Hz
- System Power B9:50 Hz
Input current
- SFX L:10 A
- System Power B9:2.5 A
Combined power (+3.3V)
- SFX L:105 W
- System Power B9:103 W
Combined power (+12V)
- SFX L:500 W
- System Power B9:276 W
Combined power (+5V)
- SFX L:105 W
- System Power B9:103 W
Combined power (+5Vsb)
- SFX L:15 W
- System Power B9:12.5 W

Side by side

Differences highlightedShow differences only

Comparison of SFX L, System Power B9
66 specifications	A be quiet! SFX L View product	B be quiet! System Power B9 View product
Power12 differ
Total powerDiffers	500 W	300 W
Peak powerKnown for one	550 W	Unknown — not stated by the source
AC input voltageDiffers	100 - 240 V	200 - 240 V
AC input frequencyDiffers	50 - 60 Hz	50 Hz
Input currentDiffers	10 A	2.5 A
Power factor	0.95	0.95
Power Factor Correction (PFC) type	Active	Active
Combined power (+3.3V)Differs	105 W	103 W
Combined power (+12V)Differs	500 W	276 W
Combined power (+5V)Differs	105 W	103 W
Combined power (-12V)	3.6 W	3.6 W
Combined power (+5Vsb)Differs	15 W	12.5 W
Max output current (+3.3V)Differs	20 A	17 A
Max output current (+12V)Known for one	41.7 A	Unknown — not stated by the source
Max output current (+5V)Differs	20 A	15 A
Max output current (-12V)	0.3 A	0.3 A
Max output current (+5Vsb)Differs	3 A	2.5 A
EfficiencyDiffers	92%	87%
Power protection features	Over current, Over power, Over voltage, Overheating, Short circuit, Under voltage	Over current, Over power, Over voltage, Overheating, Short circuit, Under voltage
Max output current (+12V1)Known for one	Unknown — not stated by the source	18 A
Max output current (+12V2)Known for one	Unknown — not stated by the source	14 A
Hold timeKnown for one	Unknown — not stated by the source	17 ms
Ports & interfaces4 differ
Motherboard power connector	20+4 pin ATX	20+4 pin ATX
Motherboard power cable lengthDiffers	30 cm	45 cm
Number of SATA power connectorsDiffers	6	4
SATA power cable lengthDiffers	600,800 mm	400 mm
Peripheral (Molex) power connectors (4-pin)Known for one	3	Unknown — not stated by the source
PCI Express power connectors (6+2 pin)Known for one	4	Unknown — not stated by the source
CPU power connector (4+4 pin)Known for one	Yes	Unknown — not stated by the source
Cabling typeDiffers	Fully-Modular	Non-Modular
Number of PATA power connectorsKnown for one	Unknown — not stated by the source	2
CPU P4 connector (4-pin)Known for one	Unknown — not stated by the source	1
CPU power cable lengthKnown for one	Unknown — not stated by the source	45 cm
Performance2 differ
Purpose	PC	PC
Power supply unit (PSU) form factorDiffers	SFX	ATX
80 PLUS certificationDiffers	80 PLUS Gold	80 PLUS
ATX version	2.4	2.4
Bearing technologyKnown for one	Sleeve	Unknown — not stated by the source
Mean time between failures (MTBF)Known for one	100000 h	Unknown — not stated by the source
Silent modeKnown for one	Unknown — not stated by the source	Yes
Design1 differ
Product colourDiffers	Black	Grey
Fan diameter	12 cm	12 cm
Number of fans	1 fan(s)	1 fan(s)
On/off switch	Yes	Yes
IlluminationKnown for one	Unknown — not stated by the source	No
Packaging content1 differ
Cables includedDiffers	AC, PCIe, SATA	AC
Certificates1 differ
Compliance certificates	RoHS	RoHS
CertificationDiffers	CE, CB, TÜV, FCC, cTUVus, RCM	CE, CB, TÜV, RCM, CU
Weight & dimensions4 differ
WidthDiffers	125 mm	150 mm
DepthDiffers	130 mm	140 mm
HeightDiffers	64 mm	86 mm
WeightDiffers	1.14 kg	1.52 kg
Packaging dataidentical
ManualKnown for one	Yes	Unknown — not stated by the source
Package widthKnown for one	205 mm	Unknown — not stated by the source
Package depthKnown for one	220 mm	Unknown — not stated by the source
Package heightKnown for one	80 mm	Unknown — not stated by the source
Package weightKnown for one	2.02 kg	Unknown — not stated by the source
Package typeKnown for one	Box	Unknown — not stated by the source
Technical detailsidentical
Sustainability certificates	ENERGY STAR	ENERGY STAR
Other features3 differ
Screws includedKnown for one	Yes	Unknown — not stated by the source
Cable ties includedKnown for one	Yes	Unknown — not stated by the source
Noise level (silent mode, <30%)Differs	9.9 dB	11.6 dB
Noise level (quiet mode, 50%)Differs	14 dB	12.1 dB
Noise level (full-load mode, 100%)Differs	28.5 dB	23.1 dB
Cable managementKnown for one	Yes	Unknown — not stated by the source
Logistics dataidentical
Harmonized System (HS) codeKnown for one	Unknown — not stated by the source	84733020

A dash means the value is not stated by the source. Unknown values are never counted for or against a product, and there is no overall score.