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Cooler Master UCP 900W PSU

by Grace - 27th July 2009
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Cooler Master UCP 900W - The Unit

The UCP 900W is an impressive looking power supply. The chassis has rounded edges and it’s sprayed with a thick textured ‘grain-like’ paint, which gives the product an unusual appearance. The UCP 900W is notably longer than typical ATX unit and considerably heavier. Most of its massive weight comes from the many long cables, which you cannot remove as this isn’t a modular product. At the sides of the unit Cooler Master printed the word ‘Ultimate’ in bold. The sticker with the unit’s electrical specifications and approvals can be seen at the top.

The rear side of the UCP 900W is entirely perforated to allow for the air pushed by the cooling fan to escape towards the outside of the case. The LED light on the rear is red as long as the system is turned off and becomes green once the system is working. There is a simple on/off switch and the AC power cable is not standard but NEMA specification. You cannot use a typical 3-DIN A/C power cable with this PSU, therefore you should be careful if you are using cable extensions or an UPS.

Cooler Master are using a Superred CHB12012BS 120mm fan to take care of the unit’s cooling. It is a typical black 120mm fan, utilizing a sleeve bearing and has a maximum rotational speed of up to 2000RPM. The fan’s speed is controlled by a logic controller inside.

From the base design of the UCP 900W and the PCB markings we easily recognise the OEM manufacturer as ACBel. ACBel has a long co-operation history with Cooler Master and virtually designed most of their PSU products. There are three large commercial grade capacitors at the primary side of the unit, two HP3 (Hitachi) 390μF/400V capacitors and one Nippon Chemi-Con 270μF/400V capacitor. The capacitors at the secondary side of the transformer are a mix from Ltec, OST and many solid capacitors from Sanyo. Unusually, the small transformer responsible for constantly feeding power to the 5VSB line can be found on a small daughterboard. The heatsinks of the unit appear to be adequate and the rectifier chips can be found sharing their own small heatsink.
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