Page 3 - Physical Look - Inside
As always, we opened up our be quiet! Pure Power 11 FM 1000W power supply to take a detailed look at what is going on inside. Please note that doing this at home may void your 5-year warranty thanks to a seal that extends over one edge of the power supply. But for the benefit of you, we cracked ours open so you do not need to, haha. There are no user serviceable parts inside.
Disassembling the be quiet! Pure Power 11 FM 1000W is quite straightforward with the removal of four screws next to the fan mount. Our photo above shows an overhead view of its internal components. Its OEM is HEC, a manufacturer of mostly budget products since 1979. This is the same as the 850W model, but different than the 550, 650, and 750W units of the same series. At first glance, the build quality appears to be excellent. There are five main heatsinks inside. The two larger ones painted black are located on the primary side, while three smaller sized heatsinks, also painted black, reside on the secondary side.
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. be quiet!, regardless of the OEM, has done a great job in the past to make sure their power supplies met or exceeded the recommended requirements in the past, and the Pure Power 11 FM 1000W is no exception. The be quiet! Pure Power 11 FM 1000W has one metal oxide varistor, three metalized polyester X-capacitors, four ceramic Y-capacitors, and two ferrite coils. This is three times the amount of X and two times the amount of Y capacitors than recommended.
On the primary side, we can see two Taiwanese-made Teapo capacitors. Japanese brand capacitors are not specified on the marketing material, and as you will see, you will not find any Japanese brand capacitors in this power supply. Our 1000W version of be quiet!'s Pure Power 11 FM series power supply incorporates two 470µF x 400V capacitors in parallel for a total of 940µF capacitance. They are rated at 105c, whereas more value-oriented power supplies usually use 85c rated capacitors.
The active PFC circuit featured on the be quiet! Pure Power 11 FM 1000W uses two Micro Commercial Products GBU15L06 bridge rectifiers attached to the largest heatsink. At 115V, the maximum rectified forward current capacity with heatsink is 15A each, so you can theoretically pull up to 3450W (15A * 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 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 three Infineon IPA60R120P7 power transistors. Each is certified for up to 16A at 100c. These transistors present a maximum resistance of 120 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. A Cree C6D10065A boost diode is placed right next them. Two ON Semiconductor NTPF110N65S3HF MOFSETs, located on the smaller heatsink next to the bulk capacitors, are used as the main switchers on the Pure Power 11 FM 1000W power supply. Each is certified for up to 19.5A at 100c and maximum resistance of 110 mΩ.
Other components that can be spotted on the primary side include a Champion CM6500UNX and CM03AX on an add-in board. A Champion CM6901T6X SLS, SRC/LLC + SR resonant controller is located at the bottom of the main PCB.
On the secondary side, we can see more Teapo capacitors rated at 105c. 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 as with modern high efficiency power supplies. Six ON Semiconductor NTMFS5H400NL power MOSFETs are responsible for generating the +12V output, located at the bottom of the main PCB with a thermal pad attached. The NTMFS5H400NL's rated continuous drain current is 210A at 100c. It has an RDS(on) value of 0.8 mΩ maximum and 0.6 mΩ typical at 25c. Additional MOSFETs on an add-in board generate the +5V and +3.3V output from the +12V rail, but I was unable to identify them as they were sandwiched between a PCB and a flat aluminum heatsink. A Weltrend WT7527RT monitoring IC on the same but opposite site of the add-in board provides over current and over/under voltage protection. 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 for the modular cable sockets. All modular sockets at the bottom are soldered directly to the main PCB after the secondary stage to reduce power transmission loss. The output connector configuration can be seen on the previous page. Overall, the internal build quality of be quiet!'s Pure Power 11 FM 1000W is very good. Components are arranged very well for optimal cooling with practically no wires running around inside, and solder points on its black PCB is very clean. I would say the be quiet! Pure Power 11 FM 1000W is generally good with regards to the selection of components used under the hood; appropriate for its performance class.
Lastly, we see a 120mm fan that provides cooling to the be quiet! Pure Power 11 FM 1000W'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. The fan is a be quiet! BQ QF2-12025-HS, as shown in our photo above. The BQ QF2-12025-HS is a rifle bearing fan specified at 0.30A for a maximum of speed of 2000 RPM. Fans with rifle bearings are quiet and have much longer lifespans compared to sleeve bearing fans and is quite suitable for this application.
Page Index
1. Introduction, Packaging, Specifications
2. Physical Look - Outside
3. Physical Look - Inside
4. Minor Tests and Conclusion
