Result Analysis and Discussion

Efficiency
Load	Pin(W)	Pout(W)	Efficiency
10 %	105.57	92.58	87.70 %
20 %	202.13	185.04	91.54 %
50 %	496.10	459.15	92.55 %
100 %	1008.50	908.75	90.11 %

The 80Plus Platinum certification requirements (90% - 92% - 89%) are surpassed especially at 20% Load. The full Load efficiency is a bit higher at 230V AC. This is the case with most of todays PSU's an it mainly originates from the reason of lower losses in the AC filtering stage and the PFC at 230V AC.

Output Stability
Load	Rail	Loading(A)	Output(V)
10 %	3.3V	1.06	3.36
	5V	1.06	5.13
	12V	6.62	12.37
20 %	3.3V	2.13	3.36
	5V	2.12	5.12
	12V	13.3	12.31
50 %	3.3V	5.32	3.34
	5V	5.28	5.09
	12V	33.19	12.24
100 %	3.3V	10.63	3.31
	5V	10.57	5.05
	12V	66.12	12.16

The Voltage Regulation of this PSU is good. It makes use of a DC-DC topology. This means, that the C 900W is mainly a 12V PSU and then generates its 5 and 3.3V from 12V. This is a modern approach, and since the Load is mainly on 12V it makes a lot of sense. For almost any PSU which makes use of this topology crossload tests do not present a problem.

Noise
Load
20 %	Noiseless
50 %	well audible

If we listen closer with the power supply, we don't here anything at 20 percent load. The C 900W is a semi passive power supply and the fan kicks in, when 35 percent load is reached. It keeps spinning until the load goes below 25 percent. This ensures adequate internal temperatures under all circumstances. When demanding 50 percent load from this unit, the noise level can be described as silent and when there is 100 percent load, the unit is well audible.

Noise/Ripple @ 100% Load
Voltage	Noise/Ripple Vpp
3.3V	0.027
5V	0.028
12V	0.025

The noise values are good. At 100% load we see that the ripple values range from 25mV to 28mV no matter which voltages we're looking at.

Page 1 - Introduction

Page 2 - Preview

Page 3 - Delivery / Specs

Page 4 - A Look Inside

Page 5 - Result Analysis and Discussion

Page 6 - Conclusion