September 30, 2022

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Cooler Master XG850 Plus Platinum PSU Review: Quality Plus RGB

5 min read


Cooler Master is a well-known brand among enthusiasts. The company began as a manufacturer of cooling systems for personal computers and quickly moved into cases and power supplies, which are responsible for most of its current fame. Today, the company enjoys global recognition and produces hundreds of products, but they never stop updating and upgrading their catalogs.

Although Cooler Master has diversified into PC gaming peripherals and even matching furniture, the company remains heavily focused on PC cases, coolers and power supplies, offering a wide selection of products in all three of these categories. At the time of this review, Cooler Master offers an incredible assortment of over 75 PC cases, 90 coolers, and 120 PSUs.

Today we’re taking a look at the new XG Plus Platinum series, the latest family of power supplies from successful PC peripheral manufacturer Cooler Master. Designed to offer a quality power supply with extra flair, the RGB fan (and RGB display) equipped XG Plus Platinum is a power supply unlike anything else on the market. The XG family ranges from 650 to 850 watts and today we evaluate the most powerful module in the series, the 850W XG850 Plus Platinum.

Cooler Master XG850 Plus Platinum
Power specifications (rated at 50 °C)
RAILWAY +3.3V +5V +12V +5 Vsb -12V
MAXIMUM POWER 20A 20A 70.8A 3A 0.3A
100W 849.6W 15W 3.6W
TOTAL 850W
AC INPUT 100 – 240 VAC, 50 – 60 Hz

Packaging and kit

Compared to most of the PC industry these days, Cooler Master is anything but subtle with its packaging design. The artwork is colorful and extravagant, mixing geometric patterns with paintings and striking colors. At the end of the day, what matters is that the unit comes in a very sturdy cardboard box and protected by enough layers of packing foam.

In addition to the typical AC power cord, mounting screws, and basic instruction booklet, Cooler Master also includes some cable ties and some cable ties with the XG Plus Platinum.

The XG Plus Platinum has a fully modular design, allowing the removal of any DC power cable, including the 24-pin ATX connector. All cables are bare, ribbon, with black wires and black connectors. No floppy connector or adapter.

Cooler Master XG850 Plus Platinum
Connector type Wired Modular
ATX 24 Pin 1
EPS 4+4 Pin 1
EPS 8 Pin 1
PCI-E 5.0
PCI-E 8 pin 6
SATA 12
Molex 4
Floppy

Cooler Master XG850 Plus Platinum PSU

Appearance

The chassis of the Cooler Master XG850 Plus Platinum PSU measures 86mm x 150mm x 160mm (H x W x D), which is 20mm deeper than a fully compatible ATX power supply. Most modern PC cases fit the length of such a high-performance PSU, but the slightly extended length can still be a compatibility issue with some small-footprint designs.

Cooler Master really want their latest PSU to stand out from the crowd, so they’ve opted for a custom chassis with an embossed left side and an integrated fan finger guard. The embossed left side will be visible if the device is placed upside down in the bottom of a typical ATX case. The device’s certifications and specifications sticker covers most of the top of the device.

A typical on/off switch can be seen on the back of the device, right next to the standard AC power jack. The perimeter of the Cooler Master logo is printed next to the switch. About half of the front of the unit is covered by the connectors for the modular cables, with a basic legend printed above each connector. Here we can also see a small connector for an internal USB cable that connects the power supply to the motherboard.

While the power is off, the right side of the unit is completely plain and, unlike the unit’s matte metal body, it’s a glossy acrylic. There is an RGB display, hidden behind the acrylic, showing the model of the unit and three practical numbers – power, temperature and fan speed. The power supply must be installed carefully because the acrylic can be scratched very easily.

However, the real issue here is the orientation of the PSU itself – if users choose a case that has the PSU compartment located at the bottom, they’ll have to choose between showing the RGB fan or the side panel display. It is also likely that the side panel display will not be visible even if the power supply is located at the top of the case, as many products are designed to hide the power supply from direct eye contact.

Interior design

Cooler Master has rebranded the 135mm RGB fan that is in the XG Plus Platinum module. The fan has a hydrodynamic sliding bearing that is quiet and reliable. It has a maximum speed of 1800 RPM, which is a lot for a fan of this size, but according to the graphics that are printed on the box, the fan should not even reach 1000 RPM under normal ambient conditions.

The XG Plus Platinum’s internals are unlike any rig we’ve come across before, with Cooler Master insisting this PSU is entirely of their own design. However, Huizhou Xinhuiyuan Technology may disagree with this statement. However, we have no details on the platform or how much Cooler Master engineers were involved in its design.

The filtering stage of the Cooler Master XG Plus Platinum PSU is textbook, with a total of four Y capacitors, two X capacitors and two filtering inductors. There is also an NTC bypass relay for increased efficiency. Rectifier bridges are placed on the main heatsink of the inverting components on the primary side. The active APFC components are attached to a separate heatsink on the side of the device. Nippon Chemi-Con supplies the large 450V/680μF APFC capacitor that sits right next to a large filter coil.

On the primary side of the main transformer, four transistors form a full-bridge inversion topology, while four MOSFETs generate the 12V line on the secondary side of the transformer. It should be noted that these four MOSFETs are JMSL040SAG from JieJie Microelectronics, a company whose products we have never encountered before. For the record, the primary-side MOSFETs (NCE65TF130) are provided by NCE Power.

The 3.3 V and 5 V lines are generated by the DC to DC conversion circuits. This would be a typical configuration for any high efficiency certified device, the unique feature here being that the conversion circuit is placed directly on the board with the cable connectors instead of separate PCBs. All secondary capacitors, both electrolytic and polymer, are supplied by Nippon Chemi-Con and Nichicon, both highly reputable Japanese manufacturers.



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