As I have mentioned above, all the three units are very much like each other, so I will only describe one of them, the A-30H, and then will point out differences from the A-30F and A-30G.
The unit has an overall air of neatness about itself. The label on the PCB indicates it actually comes from Enhance Electronics and, as far as I can judge, the ASUS A-30F corresponds to the Enhance ATX-1130F model, the A-30G to the Enhance ATX-1130G, and the A-30H to the Enhance ATX-1130H. The chip of the pulse-width modulator is also marked as Enhance 16880A.
The PSU’s LC filter with two chokes muffles the high-frequency noise from the operational pulse-width regulator. The capacitors in the high-voltage rectifier have a capacity of 680µF each, which is enough for a 300W PSU. One 3300µF capacitor is installed at the output of the +12v power rail; two 3300µF capacitors are at the output of the +3.3v rail; one 2200µF and one 3300mF are at the output of the +5v rail. All the outputs are equipped with chokes.
The heatsinks have an average thickness, about 2.5mm. This is more than in many inexpensive PSUs, but less than in models from InWin, for example. As you understand, the thickness of a heatsink affects its operation: the thinner the heatsink, the higher temperature difference is between its top and bottom. The top part of a very thin heatsink won’t work – it won’t heat up due to the insufficient heat conductivity of the material. For a small heatsink, however, 2.5mm of thickness is quite enough.
The heatsinks in the A-30H PSU are T-shaped, but a larger part of the top bar is sawed through, so that it didn’t prevent the installation of the capacitors of the high-voltage rectifier, the power transformer and the PFC choke.
Although without PFC, the A-30G PSU has the same-shaped heatsinks as the A-30H, while the single-fan A-30F uses vertical plates with “fingers” on top. The heatsinks could be made taller because of the lack of the fan on the PSU’s top; so they used cheap flat heatsinks instead of T-shaped ones, but achieved the same cooling efficiency.