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Product comparison · 2 power supply units

be quiet! System Power B8 vs CoolBox S300 power supply unit

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  • 23specifications compared
  • 19differ
  • 4identical
  • 29known for one product only

Key differences

  • Total power
    • 350 W
    • 300 W
  • AC input voltage
    • 200 - 240 V
    • 180 - 240 V
  • AC input frequency
    • 50 Hz
    • 47 - 63 Hz
  • Max output current (+3.3V)
    • 19 A
    • 6 A
  • Max output current (+12V1)
    • 20 A
    • 10 A
  • Max output current (+12V2)
    • 16 A
    • 10 A
  • Max output current (+5V)
    • 15 A
    • 6 A
  • Max output current (-12V)
    • 0.3 A
    • 0.5 A

Side by side

Differences highlightedShow differences only
52 specifications
A

be quiet!

System Power B8View product
B

CoolBox

S300 power supply unit

Model S300

View product
Power9 differ
Total powerDiffers350 W300 W
AC input voltageDiffers200 - 240 V180 - 240 V
AC input frequencyDiffers50 Hz47 - 63 Hz
Input currentKnown for one3 A
Power factorKnown for one0.98
Power Factor Correction (PFC) typeKnown for oneActive
Combined power (+3.3V)Known for one103 W
Combined power (+12V)Known for one324 W
Combined power (+5V)Known for one103 W
Max output current (+3.3V)Differs19 A6 A
Max output current (+12V1)Differs20 A10 A
Max output current (+12V2)Differs16 A10 A
Max output current (+5V)Differs15 A6 A
Max output current (-12V)Differs0.3 A0.5 A
EfficiencyKnown for one87%
Hold timeKnown for one18 ms
Power protection featuresDiffersOver current, Over power, Over voltage, Overheating, Short circuit, Under voltageOver current, Over voltage, Short circuit
Max output current (+5Vsb)Known for one2 A
Ports & interfaces1 differ
Motherboard power connector20+4 pin ATX20+4 pin ATX
Number of PATA power connectorsKnown for one2
Number of SATA power connectorsDiffers43
PCI Express power connectors (6+2 pin)Known for one1
CPU power connector (4+4 pin)Known for oneYes
ATX power connector (20+4 pin)YesYes
Cabling typeNon-ModularNon-Modular
Peripheral (Molex) power connectors (4-pin)Known for one1
CPU P4 connector (4-pin)Known for one1
Floppy disk drive connectorKnown for oneYes
Performance2 differ
PurposePCPC
Power supply unit (PSU) form factorDiffersATXSFX
80 PLUS certificationDiffers80 PLUS80 PLUS Bronze
ATX versionKnown for one2.4
Mean time between failures (MTBF)Known for one100000 h
Design2 differ
Product colourDiffersGreySilver
Cooling typeKnown for oneActive
Fan diameterDiffers12 cm8 cm
Number of fansKnown for one1 fan(s)
Fan speedKnown for one1650
Fan locationKnown for oneTop
On/off switchKnown for oneYes
Operational conditions1 differ
Operating temperature (T-T)Differs0 - 40 °C0 - 50 °C
Operating relative humidity (H-H)Known for one10 - 85%
Certificatesidentical
Compliance certificatesKnown for oneRoHS
CertificationKnown for oneErP, WEEE
Safety regulation & standardsidentical
SafetyKnown for oneCE, CB, TÜV, RCM, CU
Weight & dimensions4 differ
WidthDiffers150 mm125 mm
DepthDiffers140 mm100 mm
HeightDiffers86 mm62 mm
WeightDiffers1.6 kg593 g
Technical detailsidentical
Sustainability certificatesKnown for oneENERGY STAR
Other featuresidentical
Noise level (quiet mode, 50%)Known for one12.3 dB
Noise level (full-load mode, 100%)Known for one24.9 dB

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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