Removing the cover (the fan comprises about 80% of this surface area) we find the internals have been beefed up to handle the additional load. The layout is basically the same; however, Sky Hawk has chosen another PCB for the GM670SC as compared to the GM620SC here
Looking at the unit from another angle puts things into perspective. Sky Hawk makes use of every available space on the GM670SC, considering the PSU enclosure dimensions remain the same throughout the line things were bound to get tight at some point.
From the opposite angle clearly shows where Sky Hawk has added additional components including a third large choke at this point.
Taking a closer look we see the plethora of wires originating from the PCB and a close-up of the chokes.
At this power rating I would have liked to see an additional transformer, perhaps greater capacitance, although these parts in and of themselves would not necessarily a better power supply make. From a prima facie perspective circuit topology can give an indicator of a component's potential, ultimately only putting it to use will tell.
The absence of a rear fan is most likely due to the effectiveness of the 120mm intake which moves a substantial amount of air. This also makes room for more components within the enclosure.
The internal heatsinks are quite large in comparison to the total area and components around them. These should remove heat effectively.
From the rear the modular connector panel soldering looks to be uniform and the level of workmanship is high quality. Note individual transistors off the daughter board each have an aluminum heatsink.
The rear of the GM670SC is ventilated save for an LED, UK AC switch and AC plug. The LED is purely cosmetic, although its shape begs for a more utilitarian role.
Onto the Testing ->