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Chill CP-520A4
520 Watt silent PSU
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Results
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Voltage [V]
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3.3 V
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5 V
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12 V
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12 V2
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-12 V
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5 Vsb
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Max. current [A]
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30
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30
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20
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20
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0.8
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2.5
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Min. current [mA]
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1000
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1000
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1000
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1000
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0
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0
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Regulation*
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±5%
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±5%
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±5%
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±5%
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±10%
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±5%
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Measured regulation @ min load
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3.31
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5.20
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12.27
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-11.86
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5.04
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Measured regulation @ higher load
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3.36
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4.95
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12.07
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-11.31
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4.97
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Specified ripple* [mV]
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50
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50
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120
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50
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50
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Measured ripple @ min load [mV]
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10
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10
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10
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8
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45
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Measured ripple @ higher load [mV]
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25
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10
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12
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20.5
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58
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Test load @ min load [ohm]
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1.8
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3.3
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3.3
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-
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4.1
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Test load @ higher load [ohm]
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0.53
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0.65
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0.64
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16.1
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2
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Max load [W]
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165
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420
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9.6
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12.5
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Actual test load per line [W]
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21.2
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37.9
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227.7
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8.1
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12.4
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Total specified maximum load [W]
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520
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Total test load [W]
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307.3
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* Chill Innovation claims that the CP-520A4 complies with the ATX version 2.2 and
there are no other specifications about ripples and regulation. So we can assume that the
CP-520A4 meets the requirements of the standard.
I tripped some protections on the power supply and the effect is seen on the 5 Vsb
rail. Average power supply would have failed instantly and permanently on uderload or
short cicuit. The real ripples and regulations on the 5 Vsb should be about the same as
measured from the 5 V rail. However the ripples are very nicely in control and there is
no very bad drops on voltages. Practically I haven't ever seen that low ripples on any
computer power supply. Failure of the 5 Vsb line was pretty unfortunate as the CP-520A4
did so well other than that. Overall the results can be considered very good.
According to Chill Innovation's own tests the efficiency of the power supply is best on
300 W load - 82.45% and worst on loads under 50 Watts - 78%. Efficiency on 520 Watts is
80,12%.
Noise
This time the noise tests were done on an old system containing AMD Athlon 2600+, a
single HDD and a fanless Geforce 4-graphic card. While this system does not represent
even the lower-end modern computers in the power consumption, it's a good test bench for
noise level testing as it has no fans.
First of all I have to say I'm impressed. I decided to listen for the PSU in the
middle of the night when the ambient noise is minimal and I found it hard to hear the fan
of the CP-520A4 even from point-blank range with the side panel open. Ofcourse air
rushing through heat sinks is never entirely silent, but I'd like to say this one is
pretty much as close to as it can get.
The quiet operation isn't gained with just lowering the voltage of the fan either,
because the temperature of the exhaust air remained low, so the PSU got high enough
airflow through it.
 Questions or comments? Visit MetkuMods forum.
Additional Information
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 | Pages: 1 2 3 | |  |
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