A Detailed Look

The Riotoro Enigma 850W power supply enclosure is painted matte black and measures 160mm (6.3”) long. The back panel includes an AC receptacle and main power On-Off switch.

The power supply uses a 140mm, seven blade fan on the bottom for cooling.  The Hong Hua fan (HA1425L12F-Z) is rated for 0.22A and 1800 rpm at 12 VDC and uses standard sleeve bearings for quiet operation as far as I can tell. Riotoro refers to the fan as having a “Hydro” bearing but it’s not clear what they mean by that.

The front panel on the Enigma 850W PSU incorporates six modular cable connectors nicely keyed and labelled to prevent inadvertently plugging a cable into the wrong connector.

All of the modular cables are flat ribbon-style cables. As we mentioned earlier, we like the semi-modular configuration but at this power level we would expect to see support for a second 4+4 pin EPS cable/connector and another pair of PCI-E connectors, preferably on dedicated cables.

Under the Hood

Here are a few pictures showing the layout and components inside the Riotoro Enigma 850W power supply.  Riotoro is using Great Wall as their partner and OEM for their new power supplies.

The Enigma PSU uses DC-to-DC converters to generate the +3.3V and +5V outputs from the single +12V supply.  The layout of components is clean while the soldering appears to be very good. The two primary electrolytic capacitors are Japanese made (Rubycon rated for 390uF, 400V and 85°C) but we were disappointed to see Riotoro opted to use 85°C rated caps instead of 105°C. However, many of the caps on the secondary side are rated for 105°C (mostly Teapo, made in Taiwan) with a mix of electrolytic and solid polymer capacitors.

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