Page 3 - Physical Look - Inside
As always, we opened up our FSP Hydro G Pro 1200W power supply to take a detailed look at what is going on inside. Please note that doing this at home may void your 10-year warranty, thanks to the warranty seal FSP applied over one of the attachment screws. For your benefit, we cracked ours open, so you do not need to. There are no user serviceable parts inside.
Opening the FSP Hydro G Pro 1200W is quite straightforward with the removal of four screws. Taking out the internal components from the enclosure requires the removal of eight more. Our photo above shows an overhead view of its internal components. Its OEM is, unsurprisingly, FSP themselves. One highlight of the FSP Hydro G Pro is the inside has a conformal coating against dust, stains, and humidity for reliable operation harsh environments. It features an LLC full bridge topology with DC-to-DC converters. At first glance, the build quality appears to be excellent. There is one main heatsink inside, painted black, plus seven smaller ones either painted black or in its raw silver finish, and almost no wires.
Pulling the enclosure apart and we got straight to the internal inspection. The transient filter stage is the first input stage of a computer power supply, so we will take a look at that first. FSP has always done a great job in the past to make sure their power supplies met or exceeded the recommended requirements, and the Hydro G Pro 1200W is no exception. The FSP Hydro G Pro 1200W has one metal oxide varistor, two metalized polyester X-capacitors, four ceramic Y-capacitors, and two common mode chokes. This is two times the amount of X and Y capacitors than recommended. Considering some PSUs have missing MOVs, I am happy to see it here as this component is used to stabilize spikes from the AC line.
The active PFC circuit featured on the FSP Hydro G Pro 1200W uses two bridge rectifiers on both sides of the heatsink closest to the transient filter stage. Unfortunately, I was unable to identify their brand and part number, as there were no discernible markings on the chips.
On the largest heatsink shown in the above photo, there is one WeEn WNSC6D10650X silicon carbide diode attached to it as the APFC boost diode. Meanwhile, on the same heatsink, there are two Wuxi Unigroup Microelectronics TPP65R075DFD power MOSFETs placed. Each is certified for up to 27A at 100c. These transistors present a maximum resistance of 75 mΩ and typical resistance of 58 mΩ when turned on according to the manufacturer's data sheet. 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.
On the primary side, we can see two Japanese brand Nippon Chemi-Con capacitors. Japanese brand electrolytic capacitors are specified on the marketing material, so this is to be expected. Our 1200W version of FSP's Hydro G Pro series power supply incorporates two capacitors, both 560µF x 450V, in parallel for a total of 1120µF capacitance. They are rated at 105c, whereas more value-oriented power supplies usually use 85c rated capacitors.
Further down the line, we can see four Wuxi Unigroup Microelectronics STPR65R120M power MOSFETs as the primary switchers, located on the largest heatsink shown in the previous photo. Each is rated for up to 18A at 100c. These transistors present a maximum resistance of 120 mΩ and typical resistance of 106 mΩ when turned on according to the manufacturer's data sheet.
Champion's CM6901X resonant controller and CM6500UNX PFC controller can be found at the back of the PCB.
On the secondary side, we can see more Nippon Chemi-Con and Rubycon capacitors rated at 105c. 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. Four Infineon BSC007N04LS6 MOSFETs are responsible for generating the +12V output, located at the back of the PCB, as shown. The BSC007N04LS6's rated continuous drain current is 269A at 10V, 100c. It has an RDS(on) value of 0.7 mΩ maximum and 0.62 mΩ typical at 10V, 25c.
Four Toshiba TPHR6503PL MOSFETs are responsible for generating the +5V and +3.3V outputs, located on the side vertical board in the above photo. The TPHR6503PL's rated continuous drain current is 150A at 25c. It has an RDS(on) value of 0.65 mΩ maximum and 0.41 mΩ typical at 10V. An uPI Semiconductor uP3861P dual channel synchronous rectified buck controller and Infinno IN1S429I-DCG supervisor IC can be seen on the same board as well.
At the back, we have a large daughterboard covering the majority of the rear panel for the modular cable sockets. All modular sockets at the bottom are soldered directly to the main PCB after the secondary stage. Pin headers join the mainboard and daughterboard to reduce power transmission loss. The output connector configuration can be seen on the previous page.
Overall, the internal build quality of FSP's Hydro G Pro 1200W power supply is good -- something we would expect from an FSP-built unit. Components are arranged very well for optimal cooling with almost no wires running around inside, and solder points on its black/green PCB is quite clean in general. I would say the FSP Hydro G Pro 1200W is passable with regards to the selection of components used under the hood, acceptable for its performance class. Keep in mind most of the key ICs on the primary side are from Chinese manufacturers.
Lastly, we see a 120mm fan that provides cooling to the FSP Hydro G Pro 1200W's internal components. It is connected to an add-in board using a 2-pin connector. A 120mm fan is rather small nowadays for a power supply with a bottom mounted fan, but if not a lot of heat is being generated, noise will be kept to a minimum.
The fan model is Protechnic Electric MGA12012XF-O25, as shown in our photo above. The MGA12012XF-O25 is a fluid dynamic bearing fan specified at 0.52A for a maximum speed of 2700 RPM, 96.20 CFM air flow, 5.51 mmH2O air pressure, and 40.6 dB of noise. The fan is not supposed to activate until the PSU is loaded to approximately 360W with semi-fanless mode active. As such, it should remain off for the most part, and even when it is on, the fan speed will vary with load. Fans with fluid dynamic bearings generally have much longer lifespans compared to sleeve bearing fans and are quite suitable for this application.
Page Index
1. Introduction, Packaging, Specifications
2. Physical Look - Outside
3. Physical Look - Inside
4. Minor Tests and Conclusion
