GAMDIAS ASTRAPE P1-750G 750W (Page 3 of 4) | Reports

Page 3 - Physical Look - Inside

As we usually do, we opened up the GAMDIAS ASTRAPE P1-750G 750W power supply to take a closer look at what is going on inside. Opening up this power supply will void your ten year warranty, as the warranty seal covers one of the screws. For your benefit, we voided our warranty on this unit, so you do not need to. There are zero user serviceable parts inside anyway. Removing the top shell from the GAMDIAS ASTRAPE P1-750G 750W is pretty easy, as we just remove the four screws at the top. The OEM for the GAMDIAS ASTRAPE P1-750G 750W was not provided to us directly, though from the layout, I think it is safe to assume this is an Andyson unit. The photo above shows an overhead view of its internal components. Build quality is good, though there are quite a few glue globs around the unit. Andyson does not necessarily have the best reputation for power supplies, but we will see how this affects the build quality. Otherwise, there are several small and big heatsinks found here left in a natural silver finish.

The transient filter stage is the first input stage of any computer power supply, so we will take a closer look at this first. From here, there are two ferrite coils and one metal oxide varistor. One X-capacitor can be found here at the AC receptacle in addition to two Y-capacitors. Another set of one X and two Y-capacitors can be found near the area, making for more than twice the amount of X and Y capacitors than recommended. In addition, the MOV being present here is good, as they are intended to protect your power supply from AC line voltage spikes. A Sanken A6069H current mode control PWM regulator IC for controlling standby power can be spotted as well.

On the primary side, there is one Hitachi HU capacitor. It is rated at 680uF at 450V. It has a temperature rating of 105c. It is great to see a Japanese-made capacitor here, as some cheaper units have capacitors made from Taiwan or China. I am also happy to report the higher 105c temperature rating, as they generally boast a longer lifetime. I will say I was a bit surprised to see such a blue capacitor, but Andyson has been using Hitachi HU capacitors for a long while now.

The power supply uses two GBU10K rectifying bridges attached to a heatsink, supporting up to 10A of current at 100c. At 115V, the theoretical power you can pull from the bridge rectifier is 2300W (10A * 2 diodes * 115V) at 100% efficiency. Of course, this is purely from the bridge rectifier, and not all components in the power supply can actually hold this workload. Even so, this is well above the necessary requirements for a 750W power supply. The active PFC circuit in the GAMDIAS ASTRAPE P1-750G 750W is controlled by an unknown chip which is hidden well behind a daughterboard. Other components in the active PFC circuitry were pretty easy to get a look at. First are two Infineon IPP60R190P6 power transistors. These transistors are rated to deliver 12.7A at 100 degrees Celsius continuously. A single CREE C3D08060A Schottky diode is also found in the active PFC circuit and cooled on the same metal heatsink. Two more Infineon IPP60R190E6 MOSFET transistors can be found attached to a smaller metal heatsink and they act as the main switchers. Unfortunately, the PWM controller could not be clearly identified, though past Andyson power supplies have used Champion parts here. Each IPP60R190E6 can deliver up to 12.8A at 100 degrees Celsius continuously, with a maximum resistance of 0.19 ohms. This on characteristic is called Static Drain-Source On-Resistance or commonly abbreviated as RDS(on). The more efficient the component is, the lower the RDS(on) value, since it wastes less power with lower resistance.

As for the secondary side, there are quite a few more Japanese electrolytic capacitors made all from Nippon Chemi-Con, Nichicon, and Rubycon. This seems to be consistent with the claims from GAMDIAS of using only Japanese capacitors. The electrolytic capacitors are all rated at least 105c too. As with modern high efficiency power supplies, all rectifiers produce the +12V out -- while the +5V and +3.3V outputs are generated from the +12V output using a DC to DC converter within the power supply unit. The +12V output regulation unfortunately could not be identified as it was quite difficult to get to. On the other hand, the +5V and +3.3V rails are powered by components on two daughterboards. Each board includes an MagnaChip MDU5593S, along with an Anpec APW7073 PWM controller. The MDU5593S has a drain to source voltage of 30V, with an RDS(on) value of 0.008 ohm maximum and 0.0051 ohm typical. GAMDIAS mentions this unit has over/under voltage, over current, over power, and short circuit protections. The datasheets for all components mentioned in this review can be found on their respective manufacturer's websites.

At the back, we have a large daughterboard covering the entire rear panel. This is where the modular cable sockets go. Layout of the output connectors can be found on the previous page. Overall, the GAMDIAS ASTRAPE P1-750G 750W is a decent job in quality. Soldering is pretty good, which is good to see from Andyson. Component selection too is great with a decent layout for cooling. In addition, with the number of heatsinks in this unit, I doubt cooling will be an issue. As you can see, there is a huge gap between this daughterboard and the rest of the main PCB and I think Andyson could have done some work in utilizing this space more efficiently. The daughterboard is also connected to the main PCB using additional internal power cables.

Finally, the last component to look at is an important one, as it draws in air to let all these small components breathe easy. This is the illuminated 135mm BOK fan connected to the mainboard of the power supply. It should be noted this fan is always on, but the speeds it runs at can be changed by the user with the back-facing switch. Further research of the BDM14025S shows this fan operates at 12V and 0.20A. I do not have a whole lot of other information about the fan, though with the ten year warranty coverage by GAMDIAS, I doubt this fan should be too much of an issue. Otherwise, there is not much else to say about the power supply, so let us get onto some minor testing.

Page Index
1. Introduction, Packaging, Specifications
2. Physical Look - Outside
3. Physical Look - Inside
4. Minor Tests and Conclusion