Output Voltage Stability
The voltages boast ideal stability. The voltage on the +12V power rail is within a 1% deflection from the required level. The rest of the rails deflect no more than 3%. That’s a perfect result.
Output Voltage Ripple
The output voltage ripple is within the required limits at maximum load.
The PSU is cooled by a 140mm fan from Yate Loon which is half-covered by a piece of plastic.
The fan starts out at 1000 RPM and works at this speed until a load of 300 watts with something. Its airflow is audible but comfortable. Thus, the CFT-600-14CS is not really silent, but quiet. At loads of 500W and higher the PSU becomes loud.
Together with an APC SmartUPS SC 620, this power supply was stable at loads up to 370 watts when powered from both the mains and the batteries. The pair switched to the batteries without problems and the UPS was stable.
Efficiency and Power Factor
Despite the lack of an 80+Plus badge on the label, the efficiency is over 80% throughout a wide range of loads (at least in the 220V power grid). The peak efficiency is 86%.
The standby source is rated for a current of 3 amperes and copes with that load easily.
Compared to the APS-550S, the CFT-600-14CS has a higher wattage rating and three more benefits, namely more stable output voltages, compatibility with UPSes, and modular cables. The first benefit is insignificant, however, because the output voltages of the APS-550S do not deflect more than 3% under loads typical of modern computers, either.
The APS-550S, in its turn, is quieter and cheaper.
Comparing the CFT-600-14CS and CFT-600-14C, I can find no difference between them from an end-user’s point of view.