Page 3 - Physical Look - Inside
As expected, we opened up the Cooler Master MWE 650 White V2 650W power supply to take a closer look at what is going on inside. Opening up this power supply will void your three-year warranty, as the warranty seal covers one of the chassis screws. For your benefit, we voided our warranty on this unit, so you do not need to. There are zero user serviceable parts inside anyway. Removing the top shell is easy as it requires four screws to be removed; one at each corner on the side. Afterwards, you can slide apart the top and bottom shells to get inside. The OEM for the Cooler Master MWE 650 White V2 650W is Gospower. The photo above shows an overhead view of its internal components. Build quality from a construction stance is good, but there are quite a few globs of glue to keep the parts in place. Otherwise, there is one large heatsink and three smaller ones in a silver finish on both the primary and secondary sides.
The transient filter stage is the first input stage of any computer power supply, so we will take a closer look at this first. From here, there are two ferrite coils and a metal-oxide varistor. Two X-capacitors and three Y-capacitors are placed at the AC receptacle. In total, this is twice the X and one more Y capacitor than recommended, which is good to see.
Close by, on the primary side, there is a single CapXon capacitor rated at 470uF at 420V. It has a temperature rating of 85c. This is a Chinese brand primary capacitor with an 85 Celsius temperature rating, as opposed to Japanese capacitor with the higher 105c temperature rating found in higher end PSUs. Other major electrolytic capacitors around this board are Elite branded capacitors, which is another Chinese manufacturer.
Continuing on, the Cooler Master MWE 650 White V2 650W uses one GBU2508 rectifying bridge. This supports up to 25A of current at 100C. At 115V, the theoretical power you can pull from the bridge rectifier is 2875W at 100% efficiency. Of course, this is purely from the bridge rectifier, and not all components in the power supply can actually hold this workload. Even so, this is well above the necessary requirements for a 650W power supply. The active PFC circuit in the Cooler Master MWE 650 White V2 650W is located on a silver heatsink near the primary capacitor. The active PFC circuitry is handled by two Sanrise Tech SRC60R200. This transistor is rated to deliver 7.1A at 100 degrees Celsius continuously with a typical resistance of 0.17 ohm. Two Jilin Sino-Microelectronics switchers can also be found with a drain to source voltage of 500V, continuous drain current of 11A at 100 degrees Celsius continuously with a maximum resistance of 0.27 ohm. These on characteristics are 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. One more Xiamen Sanan SDC065J010C boost diodes are also found in the active PFC circuitry. Finally, active PFC and switching logic is controlled by a Champion CM6500UNX.
As for the secondary side, there are a few more of the aforementioned electrolytic capacitors, but the polymer capacitors are CapXon ones. 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. As such, the secondary side shows some various components. The +12V MOSFETs are four NCE Power NCE40H12 with a continuous drain current of 85A at 100c and a drain source voltage of 40V. The +5V and +3.3V converters are hidden behind a divider on a daughterboard. From other sources, these look to be four IPS FTD05N03NA with a continuous drain current of 75A at 100c and a drain source voltage of 30V. This is controlled by an ANPEC APW7159C found on the same daughterboard on the secondary side. Finally, an IN1S313I-SAG supervisor IC can be found to provide OVP, OPP, OTP, SCP, and UVP protection. The datasheets for all components mentioned in this review can be found on their respective manufacturers' websites.
Finally, you can see where all the cables are connected and sleeved to lead outside of the Cooler Master MWE 650 White V2 650W. There is nothing too special here, other than the fact there are a lot of cables running around here. Overall build quality is alright for a budget power supply. Component selection is on the lower tier of parts, but they should work fine within the warranty period. Some parts are pretty close together, but the large heatsinks and relatively open layout should for cooling.
As for cooling, a single 120mm Ong Hua HA1225H12F-Z is provided, connected to the mainboard of the power supply. The HDB or hydraulic dynamic bearing is a sign of a good quality fan, as it can operate quietly and for longer periods. Further research reveals the fan operates at 12V and 0.58A. Other fans with the same model number seem to spin at 2200RPM, but this one, as marked on the fan itself, rotates at a faster 2400RPM.
Page Index
1. Introduction, Packaging, Specifications
2. Physical Look - Outside
3. Physical Look - Inside
4. Minor Tests and Conclusion
