XPG Core Reactor 850W Power Supply Review

The XPG Core Reactor with 850W max power offers good performance and build quality, but it's expensive for what you get.

(Image: © Tom's Hardware)

Tom's Hardware Verdict

An expensive but good power supply, the XPG Core Reactor 850W has high efficiency even under very-light loads, and support for alternative sleep mode.


  • +

    Full power at 47 degrees Celsius

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  • +

    Good transient response

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    Long hold-up time

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    Compatible with the alternative sleep mode

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    Fully modular


  • -


  • -

    Not so tight load regulation at +12V

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    The fan profile could be looser

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The XPG Core Reactor with 850W capacity uses a modern and high-performance platform, which is provided by Channel Well Technology. Both its overall efficiency and output noise readings are at good levels, and this is shown by the corresponding Cybenetics certifications (ETA-A and LAMBDA-A-). Moreover, it is fully compatible with alternative sleep mode, and achieves higher than 70% efficiency with a 2% load. The Corsair RM850x delivers higher overall performance, though, and the same goes for the EVGA SuperNOVA 850 G3. The main disadvantage for the Core Reactor 850W is the price since it is more expensive than the RM850x. Nonetheless, the latter is not fully compatible with the newest ATX spec, nor does it support the alternative sleep mode support or offer >70% efficiency with a 2% load. 

XPG, ADATA's department addressing enthusiast users and gamers, enters the PSU market with the Core Reactor line. There are three members in this line, with 850W, 750W, and 650W max power. All are fully modular and 80 PLUS Gold certified. They are also certified by Cybenetics, rated as ETA-A for efficiency. 

When it comes to noise, the same organization rated the 650W and 750W models as LAMBDA-A, while the 850W unit has been certified as LAMBDA-A-. In today's review, we will take a look at the strongest member of the line, which is suitable for a powerful gaming system.


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Manufacturer (OEM)


Max. DC Output



80 PLUS Gold, ETA-A (88-91%)


LAMBDA-S++ (30-35 dB[A])


✓ (Fully)

Intel C6/C7 Power State Support

Operating Temperature (Continuous Full Load)

0 - 50°C

Over Voltage Protection

Under Voltage Protection

Over Power Protection

Over Current (+12V) Protection

Over Temperature Protection

Short Circuit Protection

Surge Protection

Inrush Current Protection

Fan Failure Protection

No Load Operation


120mm Fluid Dynamic Bearing Fan (HA1225H12F-Z)

Semi-Passive Operation

Dimensions (W x H x D)

150 x 85 x 140mm


1.47 kg (3.24 lb)

Form Factor

ATX12V v2.4, EPS 2.92


10 Years

The sample that Cybenetics evaluated has lower than 30 dB(A) overall noise output, so it is LAMBDA-A- certified. In contrast, our sample is a bit over 30 dB(A), and it is rated as LAMBDA-Standard++ in the Cybenetics scale. Usually, there shouldn't be such significant differences, and this shows that CWT used a less relaxed fan profile in the newer production batches. 

Power Specifications

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Max. PowerAmps222270.830.3
Total Max. Power (W)850

Cables & Connectors

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Modular CablesCable CountConnector Count (Total)GaugeIn Cable Capacitors
ATX connector 20+4 pin (650mm)1116-20AWGNo
4+4 pin EPS12V (650mm)2216AWGNo
6+2 pin PCIe (650mm+150mm)2416-18AWGNo
6+2 pin PCIe (650mm)2216AWGNo
SATA (500mm+145mm+145mm+145mm)31218AWGNo
4-pin Molex (500mm+150mm+150mm+150mm)1418AWGNo
AC Power Cord (1430mm) - C13 coupler1116AWG-

There are lots of cables and connectors, including two EPS, six PCIe, and twelve SATA connectors. There are no in-cable caps, and the cables that have to deal with increased Amps use thicker gauges (16AWG). Finally, it is nice to see the peripheral connectors having ample distance among them.

Component Analysis

We strongly encourage you to have a look at our PSUs 101 article, which provides valuable information about PSUs and their operation, allowing you to better understand the components we're about to discuss.

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General Data-
Manufacturer (OEM)CWT
PCB TypeDouble Sided
Primary Side-
Transient Filter4x Y caps, 2x X caps, 2x CM chokes, 1x MOV
Inrush ProtectionNTC Thermistor & Relay
Bridge Rectifier(s)2x GBU15L06 (600V, 15A @ 115°C)
APFC MOSFETs2x Vishay SiHF30N60E (650V, 18A @ 100°C, 0.125Ohm) & 1x SPN5003 FET (for reduced no-load consumption)
APFC Boost Diode1x CREE C3D10060A (600V, 10A @ 150°C)
Hold-up Cap(s)1x Nippon Chemi-Con (420V, 680uF, 2,000h @ 105°C, KMZ)
Main Switchers2x Vishay SiHF30N60E (650V, 18A @ 100°C, 0.125Ohm)
APFC ControllerChampion CM6500UNX
Resonant ControllerChampion CU6901V
TopologyPrimary side: Half-Bridge & LLC converter Secondary side: Synchronous Rectification & DC-DC converters
Secondary Side-
+12V MOSFETs8x On Semiconductor NTMFS5C430N (40V, 131A @ 100°C, 1.7mOhm)
5V & 3.3VDC-DC Converters: 2x Excelliance Mos Corp EMB04N03HR (30V, 45A @ 100°C, 4mOhm) & 2x Excelliance Mos Corp EMB02N03HR (30V, 100A @ 100°C, 1.7mOhm) PWM Controllers: ANPEC APW7159C
Filtering CapacitorsElectrolytic: 8x Nippon Chemi-Con (4-10,000h @ 105°C, KY), 1x Nippon Chemi-Con (1-5,000h @ 105°C, KZE), 2x Nichicon (2-5,000h @ 105°C, HD), 1x Nichicon (1,000h @ 105°C, VY) Polymer: 19x FPCAP, 6x United Chemi-Con
Supervisor ICIN1S313I-SAG
Fan ModelHang Hua HA1225H12F-Z (120mm, 12V, 0.58A, Fluid Dynamic Bearing Fan)
5VSB Circuit-
RectifierSilan Microelectronics SVF4N65RDTR FET (650V, 2.5A @ 100°C, 2.7Ohm) & 1x PS1045L SBR (45V, 10A)
Standby PWM ControllerOn-Bright OB5282CP

The platform is provided by Channel Well Technology, which is also the OEM of the popular Corsair RMx and RM lines, which are the direct competitors of XPG's Core Reactor models. The design is modern and clean since all power transfers are conducted through the PCB, with the only exception of the short cables that connect the main transformer with the +12V board. Nonetheless, the super-compact dimensions of the PCB don't allow for enough space between the parts, which would be beneficial for the airflow. Moreover, there are no heat sinks on the secondary side, so at increased loads, the fan will have to provide enough airflow to cool down the DC-DC converters that generate the minor rails and the +12V board.

The transient filter has all the necessary components to suppress incoming and outcoming EMI emissions. It is also equipped with a MOV, for protection against voltage surges. Finally, the PSU has an NTC thermistor and relay combo, to restrict high inrush currents. 

The pair of bridge rectifiers is installed on a dedicated heat sink.

The APFC converter uses two Vishay FETs and a single CREE boost diode, along with a Nippon Chemi Con bulk cap with enough capacity, to offer a longer than 17ms hold-up time. 

The main FETs are arranged in a half-bridge topology. This PSU uses the newer CU6901V resonant controller, which allows for higher efficiency at super-light loads, because of its burst mode support (Champion calls it kick-mode). 

The +12V FETs are installed on a daughter-board, which is installed right beside the main transformer. The afore-mentioned daughter-board is connected to the main transformer through a pair of thick wires. 

All filtering caps, both electrolytic and polymer ones, are provided by Japanese manufacturers and belong to mid and higher-level lines. 

The 5VSB circuit's parts are depicted in the photos above. 

The modular board hosts a large number of polymer caps. 

The soldering quality is good, as usually is the case with CWT's implementations. On this side of the PCB, we also find the supervisor IC, which is a N1S313I-SAG.

The cooling fan is by Hong Hua, and it uses a fluid dynamic bearing, which will last for quite long, while making less noise compared to units with double-ball bearings. 

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Contributing Editor

Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.

  • Olle P
    Hardware-wise this seems like a great PSU.
    One good thing that wasn't listed is that the housing actually adhere to the ATX-format! (Most PSUs have the wrong length.)
  • Darkbreeze
    There are no standards for depth on ATX power supplies. They vary from model to model and it has been that way since forever. Even within the same brand. This is nothing new. There is no ATX format regarding depth for it to adhere TO.

    Aris. Any idea yet whether all three capacities of this power supply are using the same platform and have the same expected or similar performance and characteristics or no idea at this time? Thanks.
  • Yeca
    I got one of this recently for a new build, and being the paranoic person that i am, i bought a psu tester and it showed a 80ms PG result. The 12V, 5V and 3.3V results were alright. Is this something i should worry about?
  • Darkbreeze
    You should start your own thread. This is not the place for such questions.
  • Yeca
    Darkbreeze said:
    You should start your own thread. This is not the place for such questions.
    Got it, thanks!