Page 3 - Physical Look - Inside
As always, we opened up our Cooler Master V1000 1000W 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.
Disassembling the Cooler Master V1000 1000W is quite straightforward, with the removal of four screws. As we have correctly guessed by the weird split motherboard ATX 24-pin modular cable header, this PSU is built by Seasonic on their new KM3 platform. Our photo above shows an overhead view of its internal components. At first glance, the build quality appears to be excellent, as one would expect from the company. Honestly, with Seasonic as your OEM, anything less would be a surprise. Its components are well organized for good cooling and reduced heat congestion as well. There are four small heatsinks inside the power supply; they are all quite low profile.
A quick tug on the shell, 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. Cooler Master has always done a great job in the past to make sure their premium power supplies met or exceeded the recommended requirements, and the Seasonic based V1000 is no exception. The Cooler Master V1000 1000W has three ferrite coils, one metal oxide varistor, three metalized polyester X-capacitors, and six ceramic Y-capacitors. This is three times the amount of X capacitors and 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 along with a TVS diode.
On the primary side, we can see two Japanese made Nippon Chemi-Con capacitors connected in parallel. Japanese made capacitors are usually what we expect from something in this price range, so this is nothing surprising. Our 1000W version of Cooler Master's V series incorporates two 390µF x 420V capacitors for a total capacitance equivalence of a single 780µF 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 V1000 1000W uses two Lite-On Semiconductor GBJ1506 glass passivated bridge rectifiers, and is controlled by an ON Semiconductor NCP1654 power factor controller. At 115V, the maximum rectified forward current capacity with heatsink is 15A each, so you can theoretically pull up to 3450W (15A * 2 diode * 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 IPP60R125CP power MOFSET transistors are used on the active PFC circuit on the Cooler Master V1000 power supply, with a Rohm Semiconductor SCS108AG SiC Schottky barrier diode. Four Infineon IPP50R250CP power transistors are attached to a dedicated heatsink, with a Champion CM6901 LLC resonant controller to boost efficiency. Each Infineon IPP60R125CP MOFSET can deliver up to 16A at 100 degrees Celsius continuously. These transistors present a maximum resistance of 0.125 ohm when turned on; with a typical resistance of 0.110 ohm according to the manufacturer's data sheet. The Infineon IPP50R250CP MOSFETs can deliver up to 9A at 100 degrees Celsius continuously; with a maximum resistance of 0.25 ohm, and a typical resistance of 0.11 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 more Nippon Chemi-Con or Rubycon 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. An Infineon CoolSET Q1 ICE2QR4765 offline SMPS quasi-resonant PWM controller with integrated power IC can be seen adjacent to the vertical PCB. The DC-to-DC converter has one ANPEC APW7159 synchronous buck PWM controller. Meanwhile, a Weltrend WT7527V IC provides over current and over/under voltage protection on the vertical PCB. An Advanced Analog Circuits AS393 voltage comparator is found in the same area.
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. This is completed in conjunction with the minor rail generation done by voltage regulator modules on the modular PCB to further improve efficiency. Six Renesas RJK0332DPB-01 power transistors to generate its +3.3V and +5V outputs from the +12V rail. The RJK0332DPB-01 MOFSETs' maximum drain current is 35A at 25c, pulsed drain current of 140A, with an RDS(on) value of 0.0047 ohm static and 0.0036 ohm typical. The output connector configuration can be seen on the previous page. Overall, the internal build quality of Cooler Master's V1000 power supply is top notch in almost every way -- something you will just come to expect when you use Seasonic as your OEM. Components are arranged beautifully for optimal cooling with almost no wires running around inside, and solder points on its red PCB is very clean in general. I would say the Cooler Master branded, Seasonic KM3 based V1000 is simply 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 V1000 1000W'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 other Cooler Master products such as the Silent Pro M2 1500W, Silent Pro Hybrid 1050W, and Cooler Master Silent Pro Gold 1000W. SilverStone's Strider Plus ST75F-P 750W and Strider Gold ST75F-G 750W also has the same fan.
1. Introduction, Packaging, Specifications
2. Physical Look - Outside
3. Physical Look - Inside
4. Minor Tests and Conclusion