Cooler Master XG850 Plus Review


Starting out as Cooler Master’s first fully in-house designed lineup, the XG series is essentially the opposite approach of what the general market has been doing the past few years. We’ve seen high-wattage PSUs scale down to 130mm, even a few SFX-L units here and there. Instead, Cooler Master chose to make a physically larger unit to make it quieter. Today, we’re taking a look if their opposite approach paid off. Let’s get into this!

General Specifications

BrandCooler Master
ModelXG Plus
Introduction year2021
Warranty10 Years

Power Specifications



Cable typeCable QuantityConnector Per CableGauge
ATX 24 pin1118 AWG
EPS 8 pin1118 AWG
EPS 4+4 pin1118 AWG
PCIe 6+2 pin3216-18 AWG
Peripheral 4 pin1418 AWG
USB 10-pin11

Oh hey, 16 AWG on PCIe! Pleasant surprise to see more companies doing that. combined with that, it also uses HCS terminals, allowing for a higher limit of 13 amps instead of the regular 9 amps. Of course, I still would prefer to have separate PCIe 8 pin cables included, the higher wire gauge and high-quality terminals does make it a lot safer to daisy-chain.

The markings of CM-PSU and PCI-E/CPU/so on are a nice touch to both see where each plug should go and what PSU the unit is meant for. As a casual reminder, the PSU side pinout isn’t standardized, and because of that you can find a ton of different pinouts, even within a single company.

Otherwise, the included cables are about what you should expect of a modern 850w. Sufficient for everything from a NAS to a high-end gaming rig.


My first reaction to the unit came down to “what… is that exhaust?”. The XG850 Plus doesn’t use the regular hexagon or circle holes, nor does it use the triangle or square exhaust I’ve complained about before. We’ll have to see from results how well this works out… more about that later.

On one side, the XG850 Plus has kind of a screen. This is to display a Cooler Master logo, the model number and a readout of the fan RPM, power used and temperature of the unit. This, combined with the ARGB fan is what differentiates the XG plus from the regular XG. While the likes of Gigabyte and Asus have fully customizable screens instead of this rather limited one, they are also significantly higher in price.

Masterplus Software

The masterplus software offers two major features to the XG850. As a first, it gives you the option to log with an interval of one second or more. This allows you to actively log fan RPM, power usage and internal temperature and automatically export this to a TXT file.

The second of course is the RGB and the screen control. You can set a total of seven pre-set effects and a custom mode giving you a total of eight individually controllable RGB zones on the fan and a single one on the screen. While it would’ve been nice to color individual sections or even letters of the screen, this should make it possible to make quite a few nice effects with it… or turn it off when you get annoyed by it.

Overall, not the most impressive setup I’ve seen, considering Corsair also allows fan control and custom multirail setups through their iCue software on i-series PSUs, it’s not underwhelming either.

You can download the Masterplus software from Cooler Master’s site here.


OCPCM6901T6X, APW7159C
OVPIN1S315I, CM6500UNX, EM8569C, APW7159C

Hm… more protections integrated into the DC-DC controller than the supervisor IC… that’s new. But hey, not an issue at all. The XG850 Plus has the protection set I expect at this price, nothing to complain.

Parts Breakdown+Internal

OEMXin Hui Yuan/Fusion Power
Input Voltage100-240VAC
Primary ConverterAPFC Full Bridge LLC
RectifierSynchronous Rectification
FanDF1352512FDHN (12V, 0.60A)
BearingFluid Dynamic
PCB TypeDouble Sided
Bulk Capacitor(s)1x Nippon Chemicon KMZ (450V, 680uf, 105c)
Bridge Rectifiers2x MCC GBU15KL (800V, 15A @ 100°C)
APFC MOSFETs2x NCE Power NCE65TF099 (650V, 24A @ 100c)
APFC Boost Diode1x Panjit CDP0865G1
PFC ControllerChampion CM6500UNX
LLC Resonant ControllerChampion CM6901T6X
Main Switches4x NCE Power NCE65TF130 (650V, 18A @ 100c)
12v MOSFETs4x Infineon BSC010N04LS (40V, 178A @ 100°C)
DC-DC Converters2x Excelliance MOS EMB04N03A, 2x Excelliance MOS EMB07N03
DC-DC ControllerANPEC APW7159C
Supervisor ICINFSitronix IN1S313I-SAG
Standby PWM ControllerExcelliance MOS EM8569C

Checks notes… Wait, this is XHY? Really? Impressive. XHY (commonly known as Fusion Power) is an OEM normally used for more budget-oriented designs like Cooler Master’s own MWE gold series, but has seemingly made some major upgrades recently considering they’re suddenly producing higher end offerings like the Cougar Polar series. I was expecting to find some soldering errors or alike but… nothing.

The bulk capacitor is a (pretty expensive) Nippon Chemicon KMZ, rated for 450V instead of the usual 400V. While there’s a shortage on these, it’s a really nice thing to have in higher end units, and while I don’t care about Japanese capacitors as a whole… it’s damn nice to see a 450V capacitor used.

Normally, I’d see the 12V MOSFETs below the PCB, but instead Cooler Master chose to put them on small daughter board on top.

Outside of that, I really like the heatsinks on this thing, the part choice is what you should expect, maybe even above of what a unit of this class should have. And while it does look rather empty, it does allow more surface area, allowing it to be cooler. Outside of it taking me the removal of 5 gooped up wires to open it, I have really nothing to complain about.

Electrical Performance

The following results are by third party PSU lab Cybenetics. The results shown are based off the XG850 (non-plus) Platinum report published on 30-08-2021.


Test Equipment

Electronic LoadsChroma 63601-5 x4
Chroma 63600-2 x2
63640-80-80 x20
63610-80-20 x2
AC SourcesChroma 6530
Keysight AC6804B
Power AnalyzersN4L PPA1530 x2
Sound AnalyzerBruel & Kjaer 2270 G4
MicrophoneBruel & Kjaer Type 4955-A
Data Loggers Picoscope TC-08 x2Labjack U3-HV x2
TachometerUNI-T UT372 x2
Digital MultimeterKeysight U1273AX
Fluke 289
Keithley 2015 - THD
UPSCyberPower OLS3000E 3kVA x2
Transformer3kVA x2

Overall (115v)

Average efficiency90,187%
Efficiency at 2% load69,752%
Average efficiency 5VSB82,128%
Standby power consumption (W)0,0476787
Average PF0,983
Average noise output26,43 DB
Efficiency rating (ETA)Platinum
Noise rating (LAMBDA)A-

Overall (230v)

Average efficiency91,887%
Average efficiency 5VSB81,459%
Standby power consumption (W)0,0868279
Average PF0,941
Average noise output27,01 DB
Efficiency rating (ETA)Platinum
Noise rating (LAMBDA)A-

Efficiency (115v)

Load (115v)EfficiencyAC (Watts)DC (Watts)
20w load72,174%27,70119,993
40w load82,362%48,56039,995
60w load86,365%69,46859,996
80w load88,302%90,52879,938
10% load88,292%96,27285,000
20% load91,363%185,992169,927
30% load91,964%277,204254,927
40% load92,081%369,244340,005
50% load91,731%463,222424,920
60% load91,164%558,818509,441
70% load90,583%656,588594,756
80% load89,849%756,351679,575
90% load89,306%856,585764,985
100% load88,494%960,314849,820
110% load87,621%1066,423934,406
Crossload 184,048%120,511101,287
Crossload 280,815%125,466101,395
Crossload 376,674%87,87567,377
Crossload 489,365%950,666849,562

Efficiency (230v)

Load (230v)EfficiencyAC (Watts)DC (Watts)
20w load72,985%27,39219,992
40w load82,659%48,38339,993
60w load86,763%69,14759,994
80w load88,987%89,83179,938
10% load88,931%95,57684,997
20% load92,341%184,021169,926
30% load93,308%273,208254,924
40% load93,621%363,168340,002
50% load93,486%454,454424,849
60% load93,145%546,894509,402
70% load92,782%640,973594,706
80% load92,309%736,138679,524
90% load91,859%832,739764,942
100% load91,342%930,307849,763
110% load90,769%1029,353934,338
Crossload 185,067%119,061101,282
Crossload 281,734%124,048101,39
Crossload 377,377%87,07267,374
Crossload 492,063%922,741849,507

Voltage Regulation (115v)

Load (115v)12V (voltage)5V (voltage)3.3V (voltage)5VSB (voltage)
20w load12.030V5.063V3.327V5.115V
40w load12.030V5.062V3.327V5.111V
60w load12.030V5.061V3.326V5.107V
80w load12.029V5.061V3.329V5.103V
10% load12.029V5.06V3.33V5.09V
20% load12.028V5.059V3.328V5.079V
30% load12.027V5.057V3.327V5.069V
40% load12.025V5.055V3.326V5.058V
50% load12.024V5.053V3.324V5.047V
60% load12.022V5.051V3.322V5.035V
70% load12.021V5.049V3.305V5.024V
80% load12.019V5.047V3.256V5.014V
90% load12.017V5.047V3.319V5.006V
100% load12.015V5.045V3.317V4.983V
110% load12.013V5.043V3.316V4.977V
Crossload 112.030V5.052V3.323V5.108V
Crossload 212.032V5.048V3.32V5.112V
Crossload 312.030V5.042V3.321V5.11V
Crossload 412.017V5.049V3.321V5.07V

Voltage Regulation (230v)

Load (230v)12V (voltage)5V (voltage)3.3V (voltage)5VSB (voltage)
20w load12.031V5.062V3.332V5.115V
40w load12.030V5.062V3.331V5.111V
60w load12.030V5.061V3.331V5.107V
80w load12.030V5.06V3.33V5.103V
10% load12.029V5.059V3.33V5.09V
20% load12.028V5.058V3.328V5.079V
30% load12.026V5.057V3.327V5.068V
40% load12.025V5.055V3.326V5.058V
50% load12.023V5.052V3.325V5.047V
60% load12.022V5.052V3.323V5.035V
70% load12.020V5.05V3.322V5.023V
80% load12.018V5.048V3.32V5.014V
90% load12.016V5.047V3.319V5.006V
100% load12.014V5.045V3.318V4.984V
110% load12.012V5.043V3.316V4.978V
Crossload 112.029V5.051V3.323V5.108V
Crossload 212.031V5.048V3.321V5.112V
Crossload 312.030V5.041V3.322V5.11V
Crossload 412.018V5.048V3.321V5.071V

Ripple (115v)

10% Load9.55mV7.32mV8.75mV8.60mVPass
20% Load12.53mV7.68mV8.95mV10.07mVPass
30% Load13.80mV8.49mV9.96mV12.55mVPass
40% Load12.81mV8.79mV9.91mV11.33mVPass
50% Load13.77mV9.56mV10.92mV12.04mVPass
60% Load15.74mV11.23mV11.63mV13.81mVPass
70% Load16.25mV11.33mV12.64mV15.99mVPass
80% Load17.16mV11.69mV13.95mV17.56mVPass
90% Load17.67mV12.75mV13.19mV16.45mVPass
100% Load27.19mV15.77mV16.58mV20.24mVPass
110% Load29.49mV16.84mV18.04mV22.27mVPass

Ripple (230v)

10% Load10.76mV7.93mV10.16mV11.23mVPass
20% Load14.26mV8.03mV9.20mV9.97mVPass
30% Load15.27mV8.74mV9.66mV11.13mVPass
40% Load12.33mV9.35mV10.46mV12.04mVPass
50% Load13.06mV10.17mV10.36mV10.98mVPass
60% Load14.13mV9.76mV10.82mV12.04mVPass
70% Load14.94mV10.52mV11.17mV12.30mVPass
80% Load16.71mV11.38mV12.89mV12.85mVPass
90% Load17.47mV11.89mV12.44mV12.96mVPass
100% Load25.42mV14.82mV15.25mV15.37mVPass
110% Load27.63mV15.85mV16.26mV15.77mVPass

Fan Speed/Noise (115v)

Load (115v)RPMNoise (DBa)Temperature inTemperature out
20w load0<637.03°C40.24°C
40w load0<637.91°C41.51°C
60w load0<638.89°C42.89°C
80w load0<639.16°C43.76°C
10% load0<639.65°C44.65°C
20% load0<640.3°C45.82°C
30% load0<640.87°C46.87°C
40% load0<641.38°C47.88°C
50% load0<641.56°C48.56°C
60% load55912,841.85°C49.38°C
70% load92729,142.28°C50.13°C
80% load120736,843.72°C52.12°C
90% load149542,343.9°C53.02°C
100% load159244,144.68°C54.88°C
110% load160344,246.79°C57.55°C
Crossload 10<642.01°C49.25°C
Crossload 20<643.12°C51.26°C
Crossload 30<644.52°C53.52°C
Crossload 4123537,645.02°C55.29°C

Note: the Plus version is always spinning, unlike the regular XG. So the fancurve might be slightly louder overall, but not noticeably

Fan Speed/Noise (230v)

Load (230v)RPMNoise (DBa)Temperature inTemperature out
20w load0<636.83°C40.03°C
40w load0<636.91°C40.71°C
60w load0<637.75°C42.25°C
80w load0<638.38°C43.38°C
10% load0<640.33°C45.83°C
20% load0<640.88°C46.72°C
30% load0<641.77°C48.21°C
40% load0<642.28°C49.06°C
50% load0<642.56°C49.86°C
60% load54812,242.78°C50.84°C
70% load93929,643.34°C51.95°C
80% load118036,143.85°C52.81°C
90% load144041,344.74°C54.11°C
100% load159544,145.71°C55.64°C
110% load160444,346.77°C57.66°C
Crossload 10<642.26°C49.09°C
Crossload 20<643.56°C50.71°C
Crossload 30<644.93°C53.25°C
Crossload 41576<645.89°C56.21°C

Note: the Plus version is always spinning, unlike the regular XG. So the fancurve might be slightly louder overall, but not noticeably

Hold-up Time (230v)

Hold-up time (ms)26,1
AC loss to PWR-OK hold up time (ms)22
PWR_OK inactive to DC loss delay (ms)4,1


Honestly, the XG850 plus impressed me. The build quality of it is amazing, the part choice makes total sense, even going above others in some cases with for example a 450V bulk capacitor and a really nice DC-DC controller.

However, my review won’t be fully without complaints. The screen has a limited amount of use and I would’ve liked to have individual PCIe cables included mainly for cable management sake. It’s also quite a bit more expensive than the regular XG850, making that generally a better option for most people.

But if what you’re looking for is a high-end RGB PSU with digital functionality, the XG850 Plus should definitely be in your consideration.

Cooler Master XG850 Plus

Buy XG850 Plus
  • Great part choice
  • Impressive build quality
  • Quiet
  • Efficient
  • ARGB
  • Software integration
  • Expensive
  • Limited use to the screen



Silverstone Hela 850R

Buy Hela 850R
  • Slightly more quiet
  • ATX 3.0 compatible
  • Included 12VHPWR connector
  • Not yet widely available
  • No ARGB or screen


Cooler Master XG850

Buy XG850
  • Significantly cheaper
  • Same part choices
  • No screen or ARGB


Fractal Design Ion 2

Buy Ion 2 860w
  • Generally cheaper than XG850
  • Fixed fan curve compared to Ion+
  • Worse part choice
  • Significantly cheaper
  • Same HCS terminals and 16 AWG wires used
  • Less efficient
  • Worse part choice
  • RMe isn't widely available yet


  • Significantly cheaper
  • Same HCS terminals and 16 AWG wires used
  • White and black options
  • Less efficient
  • Worse part choice


Adata XPG Core Reactor

Buy XPG Core Reactor 850w
  • Significantly cheaper
  • Same HCS terminals and 16 AWG wires used
  • Less efficient
  • Worse part choice

Thermaltake PF1 ARGB

  • Similar build quality
  • Well-covered base platform
  • ARGB
  • No screen
  • Expensive


Thermaltake GF1 ARGB

Buy GF1 ARGB 850w
  • Significantly cheaper
  • ARGB
  • No screen
  • Less efficient
  • Worse part choice


Superflower Leadex III ARGB

Buy Leadex III ARGB 850W
  • Significantly cheaper
  • ARGB
  • Low AWG wires on second PCIe connector
  • No screen
  • Less efficient
  • Worse part choice

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