Cooler Master V750W PSU Review: Petite And Powerful
So far it’s a pretty compelling looking part. As stated before, I am no electrical engineer with hardcore testing equipment, but what I can do is crank open the PSU and see what we should expect to see component wise to determine whether this PSU is a high quality unit–and that means looking at the capacitors, soldering, the amount and quality of components and whether they use a high end regulation technique.
The first thing that struck me was that despite the size, the internals were still neat and mostly well spaced out, which would help with effective cooling. The soldering on the unit is very clean and crisp, with the only eye-sore being the few mounds of white thermal glue–although they serve a purpose of providing stability to the components, they could have been done a tad neater. The reason for the smaller size can be found on the inside, where since they have used Enhance Electronics as their OEM, it makes use of a 3D circuit design in order to save space. The red PCB on the left pictured below is where some of the functions of the PSU have been off-loaded vertically (i.e 3D design)
Not that it matters much (since we wont see them), but the black heatsinks do look quite good, with the secondary heatsink containing the OTP diodes attached to monitor temperatures.
The line filtering/transient stage is well equipped with a total of 3 X and 4 Y capacitors, two ferrite coils and one MOV. While on the primary switch side we have four Infineon IPP50R280CE mosfets as the main switchers, while the PFC controller chip is obscured by solder, I suspect it’s the same Champion CM6502TX and CM03X Green PCF controller used in the older CM 750W semi-modular PSU. On the other side of the primary heatsink we find the 2 primary rectifying MOSFETS, IPP60R190P, as well as the STMicoelectronics STTH12R06D boost diode.
On the A PFC side we see a primary Panasonic capacitor rated at 105C° while we also get another a ferrite coil as well as a thermistor for helping to protect against large inrush currents. In fact, just like the box says, all the capacitors seen inside are Japanese capacitors(rate at 105C°)–Nippon Chemi-Con (KZE and LXZ designation), Rubycon, Suncon and Panasonic (primary cap), with some Nichicon polymer caps on the secondary side.
Although having good caps are great, the sign that this is a high quality and modern PSU is found in the way voltage regulation and filtering is done on the secondary side. Cheaper units merely have a simple ferrite coil/mosfet solution with a few capacitors (group regulation) dedicated to cut up and clean out the residual AC ripple in the converted DC voltage. Cooler Master, however, employ a much more modern and high end solution.
They make use of DC-DC converters with Nichicon polymer caps for the 3.3V and 5V rails, while the 12V rail is taken care of by 4 Infenion IPP023N04N rectifying MOSFETS on the heatsink and some Nippon Chemi-Con and Rubycon capacitors for the line filtering. Since this PSU is rated to take 744W along the single 12V rail, having well regulated and ripple free DC on the 12V rail is key.
Go To Page 4: Testing