Cooler Master Ultimate Circuit Protection 900W 4

Cooler Master Ultimate Circuit Protection 900W

Efficiency & Fan Noise »


The UL certification number E320127 reveals that this PSU is made by Cooler Master Ltd.

Cooler Master Ultimate Circuit Protection UCP 900W, RS-900-AAAA-A3
AC Input100V-240V, 6.3-12A max., 50-60 Hz
DC Voltage+3.3V+5V+12V1+12V2+12V3+12V4+5VSB
Max. Output 25A25A25A20A22A22A4A

Tested on: AMD Athlon64 FX-62 @ 2800 MHz, ABIT AT8, 2x 512 MB DDR400, WD Raptor 36 GB, Radeon X1900 XTX + Radeon X1900 XTX Crossfire

All voltages are very stable, especially the 3.3V and 5V lines deliver excellent results.

For an unknown reason the ripple voltage is very high with 78 mV. However, we couldn't find any negative effects of this during our review. The PSU was stable at all times.

Standard deviation 3.3V5.50
Standard deviation 5V3.01
Standard deviation 12V8.21
Power Factor1.00
Ripple Voltage 12V78.0 mV
Power Efficiency82.1% (335W:408W)

For easier comparison between power supplies we put the (normalized) line regulation standard deviation into graphs.

Standard deviation is a statistical term, which tells how far away from the average the measurements are. In other words it's the average of the average.
A large standard deviation indicates that the data points are far from the average and a small standard deviation indicates that they are close within the average.
So the smaller the standard deviation is, the better the line regulation.
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