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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

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

For more test data about these three and other power supplies, please refer to our power supply charts.

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

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