Cooler Master Silent Pro Hybrid 1050W (Page 3 of 4) | Reports

Page 3 - Physical Look - Inside

As always, we opened up our Cooler Master Silent Pro Hybrid 1050W power supply to take a detailed look at what is going on inside. Please note that doing this at home will void your 5-year warranty, thanks to the warranty seal Cooler Master applied over one of the attachment screws. But for the benefit of you, we cracked ours open so you don't need to, haha. There are no user serviceable parts inside.

While the Cooler Master Silent Pro Hybrid 1050W has quite a few differences compared to the Cooler Master Silent Pro Gold 1000W on the outside, it is actually very similar internally. Built by the same OEM (Enhance), our photo above shows an overhead view of the its internal components. At first glance, the build quality seems to be pretty decent, as one would expect from Enhance. It is actually pretty packed up inside, but components are well organized for optimal cooling and reduced heat congestion as one would expect from a modern day performance power supply. There are two main heatsinks inside the power supply, with all of them finned at the top. They are fairly evenly spread around the interior to even out heat distribution and improve airflow to the components, as shown in our photo above. Cooler Master calls this heatsink layout "HTT", or Heat Transfer Technology, which is just a fancy term for L-shaped aluminum heatsinks.

The transient filter stage is the first input stage of a computer power supply, so we will take a look at that first. Cooler Master has done a great job in the past to make sure the Silent Pro Gold line met or exceeded the recommended requirements, and the Silent Pro Hybrid series is certainly no exception. The Cooler Master Silent Pro Hybrid 1050W has two ferrite coils, one metal oxide varistor, four metalized polyester X-capacitors, and four ceramic Y-capacitors. That is four times as many X capacitors and twice as many Y capacitors than recommended. Considering how many 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.

On the primary side, we can see three Japanese made Panasonic/Matsushita capacitors connected in parallel. Japanese made capacitors are usually what we expect from something in this price range, so this is nothing surprising. Our 1050W version of Cooler Master's Silent Pro Hybrid incorporates three 330µF x 420V capacitors for a total capacitance equivalence of a single 990µF x 420V capacitor (Remember that values add up when capacitors are hooked up in parallel, unlike resistors). These units are rated at 105c; whereas more value oriented power supplies usually use 85c rated capacitors.

The active PFC circuit featured on the Cooler Master Silent Pro Hybrid 1050W uses two Diodes Incorporated GBU1006 glass passivated bridge rectifiers, and is controlled by a Champion CM6802 PFC/PWM controller combo. At 115V, the maximum rectified forward current capacity with heatsink is 10A for each diode, so you can theoretically pull up to 2300W (10A * 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. Two Infineon IPW50R140CP power MOFSET transistors are used on the active PFC circuit on the Cooler Master Silent Pro Hybrid 1050W power supply. Another two in forward configuration is used in the switching section, plus a Fairchild Semiconductor FQPF8N80C 800V N-Channel MOSFET on the other side. Each Infineon MOFSET can deliver up to 15A at 100 degrees Celsius continuously. These transistors present a maximum resistance of 0.140 ohm when turned on; with a typical resistance of 0.130 ohm according to the manufacturer's data sheet. The Fairchild Semiconductor MOSFET can deliver up to 5.1A at 100 degrees Celsius continuously; with a maximum resistance of 1.55 ohm, and a typical resistance of 1.29 ohm. 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 secondary side, we can see a mix of Rubycon and Nippon Chemi-Con 105c capacitors. I am pleasantly surprised by this, as most companies usually resort to cheaper Taiwanese 85c units for secondary capacitors. As with modern high efficiency power supplies, all rectifiers produces 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. To further increase efficiency, the transformer has an embedded heatsink, which Cooler Master claims to have the size reduced by 25%. The transistors -- which are used as rectifiers -- are placed as close to the terminals as the transformer as possible, so the least amount of energy is used in the traveling process. The company calls this 'Hybrid Transformer' and 'Hyper Path', respectively.

The DC-to-DC converter has one ANPEC APW7073 synchronous buck PWM controller and a series of Infineon OptiMOS 3 IPP023N04NG power transistors for its rectification and DC +3.3V/+5V/+12V output process. An extra regulator is provided to run its integrated dual 7V fan ports. The IPP023N04NG MOFSETs' maximum drain current is 90A at both 25c and 100c, pulsed drain current of 400A at 25c, with an RDS(on) value of less than 0.0023 ohm. Meanwhile, four shunt resistors provides over current protection, and the Silent Pro Hybrid also has over voltage, overload, over temperature, under voltage, and short circuit protection.

At the back, we have a large daughterboard covering the entire rear panel for the modular cable sockets. It is connected to the mainboard by a series of wires after the secondary stage, as shown in our past couple of photos. The output connector configuration can be seen on the previous page. Overall, the internal build quality of Cooler Master's Silent Pro Hybrid 1050W power supply is very good -- for the price you are paying, it better be, haha. Components are arranged beautifully for optimal cooling, and solder points on its black PCB is pretty clean in general. I would say the Enhance manufactured Cooler Master Silent Pro Hybrid 1050W is overall excellent with regards to the selection of components used under the hood.

Lastly, we see a large 135mm fan that provides cooling to the Cooler Master Silent Pro Hybrid 1050W's internal components. It is connected to the mainboard using a 2-pin connector. A 135mm fan is only marginally smaller than the 140mm maximum you can fit in an ATX power supply, and it is beneficial in most cases in providing lots of airflow at lower speeds for quiet operation. Young Lin Tech Co. is the fan OEM, with DFS132512H as the model number, as shown in our photo above. Further research indicates the DFS132512H is a ball bearing fan specified at 0.25A for a maximum of speed of 1700 rpm. The rated airflow is 91.16 CFM at 36.28 dB of noise. This is the same fan used in the SilverStone Strider Plus ST75F-P 750W, SilverStone Strider Gold ST75F-G 750W, and Cooler Master Silent Pro Gold 1000W.

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