A Detailed Look

The EVGA 650 GQ power supply enclosure is painted with a matte black hammertone finish and measure 165mm (6.5”) long.  The back panel includes an On-Off switch, AC receptacle and open honey-comb grill.

Around on the front side, you will note a small 2-position switch up in the bottom-left corner in the photo above labeled “ECO OFF/ON”. The 650 GQ power supply incorporates EVGA’s ECO Intelligent Thermal Control System for fan speed control. This allows the end user to select silent, fan-less operation for low to mid power applications if desired. Unlike some previous SuperNOVA PSUs, the switch is located on the front of the power supply instead of the rear, which makes the switch harder to access once the PSU is installed.

With the ECO Thermal Control System turned ON, the power supply cooling fan does not start spinning until the internal component temperatures reach a pre-programmed setting. The fan then starts out at low speed and gradually ramps up based on load and temperature (see graph above).

The power supply uses a 135mm, seven blade fan on the bottom for cooling.  The Protechnic Electric fan (MGA13512XF-025) is rated for 0.38A at 12 VDC and is controlled by the ECO Thermal Control System. It features a fluid dynamic bearing for long life and quiet operation. This is the same fan used in the 750W version.

The front panel on the 650W GQ incorporates eight modular cable connectors, along with the ECO fan mode control switch, all nicely labeled. The 24-pin ATX cable/connector is fixed (as it should be IMHO).

All of the modular cables are flat ribbon-style and the 24-pin ATX is sleeved with a black nylon mesh covering.

Under the Hood

Here are a few pictures showing the layout and components inside the EVGA 650W GQ power supply.  For the GQ series, EVGA appears to be using FSP as their OEM of choice.

The new GQ series features a traditional circuit design and the layout of components is clean while the soldering appears to be very good. All of the capacitors used inside the GQ PSU are high-quality Japanese made (primarily Nippon Chemi-con) electrolytic and solid polymer caps. The 650W GQ uses a single primary capacitor rated for 330uF, 420V and 105°C.

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