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Product comparison · 2 power supply units

be quiet! Straight Power 11 vs be quiet! System Power B9

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  • 48specifications compared
  • 33differ
  • 15identical
  • 21known for one product only

Key differences

  • Total power
    • 750 W
    • 300 W
  • AC input voltage
    • 100 - 240 V
    • 200 - 240 V
  • AC input frequency
    • 50 - 60 Hz
    • 50 Hz
  • Input current
    • 10 A
    • 2.5 A
  • Power factor
    • 0.99
    • 0.95
  • Combined power (+3.3V)
    • 150 W
    • 103 W
  • Combined power (+12V)
    • 750 W
    • 276 W
  • Combined power (+5V)
    • 150 W
    • 103 W

Side by side

Differences highlightedShow differences only
69 specifications
A

be quiet!

Straight Power 11View product
B

be quiet!

System Power B9View product
Power18 differ
Total powerDiffers750 W300 W
Peak powerKnown for one820 W
AC input voltageDiffers100 - 240 V200 - 240 V
AC input frequencyDiffers50 - 60 Hz50 Hz
Input currentDiffers10 A2.5 A
Power factorDiffers0.990.95
Combined power (+3.3V)Differs150 W103 W
Combined power (+12V)Differs750 W276 W
Combined power (+5V)Differs150 W103 W
Combined power (-12V)Differs6 W3.6 W
Combined power (+5Vsb)Differs15 W12.5 W
Max output current (+3.3V)Differs25 A17 A
Max output current (+12V1)Differs20 A18 A
Max output current (+12V2)Differs20 A14 A
Max output current (+12V3)Known for one24 A
Max output current (+12V4)Known for one24 A
Max output current (+5V)Differs25 A15 A
Max output current (-12V)Differs0.5 A0.3 A
Max output current (+5Vsb)Differs3 A2.5 A
EfficiencyDiffers93%87%
Hold timeDiffers19.6 ms17 ms
Ports & interfaces6 differ
Motherboard power cable lengthDiffers60 cm45 cm
Number of PATA power connectorsDiffers42
Number of SATA power connectorsDiffers114
SATA power cable lengthDiffers550 mm400 mm
PCI Express power connectors (6+2 pin)Known for one4
PCI Express power cable lengthKnown for one60 cm
CPU power connector (4+4 pin)Known for oneYes
CPU power cable lengthDiffers70 cm45 cm
Floppy disk drive connectorKnown for oneYes
PCI Express connectorKnown for oneYes
Cabling typeDiffersFully-ModularNon-Modular
CPU P4 connector (4-pin)Known for one1
Performance1 differ
80 PLUS certificationDiffers80 PLUS Gold80 PLUS
EPS versionKnown for one2.92
Bearing technologyKnown for oneFDB
Design2 differ
Product colourDiffersBlackGrey
Cooling typeKnown for oneActive
Fan diameterDiffers13.5 cm12 cm
Certificates1 differ
CertificationDiffersCE, FCC, TÜV, cTUVus, RCM, BSMI, CUCE, CB, TÜV, RCM, CU
Weight & dimensions2 differ
DepthDiffers170 mm140 mm
WeightDiffers1.78 kg1.52 kg
Packaging dataidentical
ManualKnown for oneYes
Package widthKnown for one248 mm
Package depthKnown for one328 mm
Package heightKnown for one102 mm
Package weightKnown for one3.34 kg
Other features3 differ
Screws includedKnown for oneYes
Cable ties includedKnown for oneYes
Noise level (silent mode, <30%)Differs8.4 dB11.6 dB
Noise level (quiet mode, 50%)Differs9.01 dB12.1 dB
Noise level (full-load mode, 100%)Differs21.23 dB23.1 dB
Cable managementKnown for oneYes
Packaging contentidentical
Cables includedKnown for oneAC

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.

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