Silent Running: Two Fanless Power Supplies And A Quiet One, Tested

Test Setup, Hold-Up Time, Inrush Current, Peak Load, And Short Circuit Protection Test

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Test Hardware
AC SourceChroma Programmable AC Source 6530
Power MeterYokogawa WT210 Digital Power Meter
Loads4 x 600 W Chroma 63306 for 12 V testing4 x 300 W Chroma 63303 for 5 and 3.3 V testingusing Chroma HighSpeed- DC Load Mainframes 6334
OscilloscopeTektronix DPO3034 Digital Phosphor Oscilloscope (300 MHz)
Test Procedure
Voltages110 and 230 V
Standby Power0.25 A fixed current to simulate PC standby power on 5 Vsb
80 PLUS Efficiency Testing100/50/20% load, relative to specified total output Load distribution across 12/5/3.3 V rails at the same proportion as specified for 100% testing at 110 V according to ATX 2.3 specification
Efficiency at Fixed Loads25, 50, 85, 300, 500 W loads Load distribution across 12/5/3.3 V rails at the same proportion as specified for 100%
Peak Load Test110% Overload Testing at maximum combined 12 V
Temperature TestAir intake vs. Outtake temperature delta tracking highest delta during all tests

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Short Circuit Protection Test at 12 V
Power Supply / Mains VoltageTest Passed
Seasonic X-460 (115 V)Yes
Seasonic X-460 (230 V)Yes
be quiet! Straight Power E9 CM 480 W (115 V)Yes
be quiet! Straight Power E9 CM 480 W (230 V)Yes
SilverStone SST-ST50NF (115 V)Yes
SilverStone SST-ST50NF (230 V)Yes