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PSU Review – Corsair AX1200 1200W 80Plus Gold

The AX1200 is cooled by a 140mm fan made by Yate Loon, a Taiwanese electronics manufacturer, and it is a ball bearing fan with a maximum rotational speed of 2800RPM. Corsair definitely likes these Yate Loon fans; we can find them in almost every single one of their power supplies.

Corsair managed to surprise us as the AX1200 is not made by either of the OEM’s (Channel Well and Seasonic) they have been cooperating with in the past; Flextronics is the OEM of the AX1200 power supply.  

The filtering stage of the unit is incredible; it consists of an A/C receptacle with an integrated line filter and continues on the main PCB with four Y-type capacitors, two X-type capacitors, two ferrite coils and a surge suppressing MOV. Flextronics cleverly inserted a power relay which cuts off the power supply from the A/C source entirely once the PSU shuts down, minimizing the power consumption when the computer is off.

The two primary capacitors are made by Nichicon and are rated at 420V/470μF each. The secondary side capacitors are a mix of Nippon Chemi-Con electrolytic capacitors and solid capacitors. Instead of two large primary and secondary side heatsinks, each set of components is mounted on its own large heatsink. Flextronics probably designed the unit like this not because of the quasi-resonant topology but because they wanted to avoid heat exchange between different parts or groups of parts.

Finally, this unit is using two voltage regulator modules (VRMs) and two transformers to regulate the single, monstrous 12V rail. There is no 5V and/or 3.3V line; these are created by DC to DC circuits.

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