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Seasonic Platinum Series 660W Power Supply Review

Manufacturer: Seasonic

Under the Hood

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The Seasonic Platinum 660W power supply is based on the X-Series design, which becomes apparent as soon as the cover is removed.  The most obvious feature is the +3.3V and +5V voltage regulators have been moved off of the main PCB (or daughter cards) and onto the modular DC connector board, which mounts to the front of the enclosure.  This is a major innovation shared by all X-Series power supplies and offers several advantages.

• Reduced wiring results in less resistance to current flow and higher efficiency
• Reduced wiring also results in a cleaner layout with better airflow
• Reduced part count results in higher reliability and lower cost

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(Courtesy of Seasonic)

The biggest advantage to moving the two VRMs onto the DC connector board is that it virtually eliminates the high current distribution wiring that previously had to route the +3.3V and +5V outputs to the connector panel.  This distribution wiring had to carry high currents and therefore was subject to line resistance and voltage losses.  With the new design, only +12V has to be delivered to the modular DC connector board, which can be distributed more efficiently with fewer and smaller wires (as voltage goes up, current goes down for the same power).     

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The Platinum 660W main PCB is basically a +12V PSU that also includes a small -12V regulator and the +5VSB section.  All of these output voltages are sent out via modular connectors soldered directly onto the front of the main PCB.  Additional connectors supply all the other connectors directly from sockets soldered onto the modular DC connector board.

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Looking inside the Platinum 660W PSU, you will see the two main Japanese made capacitors on the primary are rated at 220uF, 420V, and 105°C.  The secondary features predominantly solid polymer capacitors with a few Nippon Chemi-Con electrolytic caps thrown in for good measure.  Just like all previous X-Series power supplies we have seen, the layout and component selection appears to be excellent.

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January 25, 2013 | 05:51 PM - Posted by Anonymous (not verified)

F, bought the 1000watt version back in May and it came with the ugly colored modular cables.

May 1, 2013 | 11:42 PM - Posted by Anonymous (not verified)

hello there, I have a question, since you got that colored modular cables, did you report that to seasonic and did you make a request of being provided with black cables for it? just wondering because if I will be getting one, I might get colored cables too.

January 25, 2013 | 06:42 PM - Posted by Patrick (not verified)

Love me some Seasonic.

January 27, 2013 | 11:40 PM - Posted by pdjblum

Seasonic is always my first choice when I am in the market for a new psu. Not only are the psu's excellent, but so too is their customer service.

January 31, 2013 | 10:52 AM - Posted by SS (not verified)

Just got two of these and both of them had coils noise and one also coil whine. Sent them back, very disappointed. (Tested on several platforms and the noise was persistend, even on professional APC UPS)

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