FSP Hydro G Pro 750W Report (Page 3 of 4)

Page 3 - Physical Look - Inside

As always, we opened up our FSP Hydro G Pro 750W power supply to take a detailed look at what is going on inside. Please note that doing this at home will void your 10-year warranty, thanks to the warranty seal FSP applied over one of the attachment screws. It is great it comes with a 10-year warranty, which is much longer than past FSP models and is becoming the industry standard for performance PSUs. For the benefit of you, we cracked ours open, so you do not need to. There are no user serviceable parts inside.

Opening the FSP Hydro G Pro 750W 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 interior is coated for reliable operation in up to 95% relative humidity conditions. It features an LLC half bridge topology with DC to DC converters. At first glance, the build quality appears to be excellent. There are three main heatsinks inside and almost no wires. A big and small heatsink are located on the primary side, both of which are painted black. One other black colored heatsink can be found down the line with two integrated circuits attached to it.

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 FSP Hydro G Pro 750W is no exception. The FSP Hydro G Pro 750W 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 modern day 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 750W uses two Diodes Incorporated GBJ2506 bridge rectifiers on both sides of the first heatsink. At 115V, the maximum rectified forward current capacity with heatsink is 25A each, so you can theoretically pull up to 5750W (25A * 2 diodes * 115V) from the bridge rectifier at 100% efficiency. Of course, this is limited by the fact that it is not 100% efficient and also neglects the fact that not every component in the system are able to keep up. Further down the line, on the outside of the largest heatsink, we can see two Toshiba TK20A60U transistors. Each is certified for up to 20A at 25c. These transistors present a maximum resistance of 0.190 ohm and typical resistance of 0.165 ohm 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. A Cree C3D06060A Schottky diode is placed right next it. A Unisonic Technologies 4N65K-TA power MOSFET is found on the same heatsink in the Hydro G Pro 750W power supply as well.

On the primary side, we can see one Japanese brand Hitachi capacitor. 100% Japanese brand capacitors are specified on the marketing material, so this is to be expected. Our 750W version of FSP's latest Hydro series power supply incorporates one 560µF x 450V capacitor. It is rated at 105c; whereas more value-oriented power supplies usually use 85c rated capacitors.

The heatsink shown in the photo above has two STMicroelectronics STF28N60M2 power MOSFETs attached to it. Each is certified for up to 14A at 100c. These transistors present a maximum resistance of 0.150 ohm and typical resistance of 0.135 ohm when turned on according to the manufacturer's data sheet.

On the secondary side, we can see more Japanese brand capacitors from United Chemi-Con and Rubycon 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 Nexperia PSMN1R0-40YLD MOSFETs are responsible for generating the +12V output, located at the back of the PCB for additional cooling, shown in the second photo. The PSMN1R0-40YLD's rated continuous drain current is 280A at 25c. It has an RDS(on) value of 0.0011 ohm maximum and 0.00093 ohm typical. The +5V and +3.3V outputs are generated by six Diodes Incorporated DMN3009SK3 MOSFETs on an add-in board, shown in the first photo. Each is certified for up to 20A at 25c. These transistors present a maximum resistance of 0.0055 ohm and typical resistance of 0.0025 ohm when turned on according to the manufacturer's data sheet. Meanwhile, a Weltrend WT7527 monitoring IC provides over/under current and over/under voltage protection. ANPEC's APW7159 is the synchronous buck PWM controller. The datasheets for all components mentioned in this review can be found on their respective manufacturers' websites.

At the back, we have a large daughterboard covering the entire 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 750W 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 750W is generally excellent with regards to the selection of components used under the hood.

Lastly, we see a 120mm fan that provides cooling to the FSP Hydro G Pro 750W'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, it should not be much of an issue. A 120mm fan is used to keep the enclosure as small as possible. Protechnic Electric is the fan OEM with MGA12012XF-O25 as the model number, as shown in our photo above. Further research indicates the MGA12012XF-O25 is a fluid dynamic bearing fan specified at 96.20 CFM, 5.51mmH2O, 40.6 dB(A), and 0.52A for a maximum of speed of 2700 RPM.

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