XIGMATEK NRP-MC851 Power Supply

On First Page2. The Unit


Despite being a new player in the market Xigmatek have quickly earned a good reputation from their innovative cooling solutions, which are the primary focus of the company. That said they have also released some high quality power supplies and we reviewed their high end 1500w model a short while ago.

Today we will have a look at the NRP-MC851, a very high performance product with a maximum power output of 850W. This "No Rules Power" series PSU boasts some remarkable specifications which should easily catch the attention of any enthusiast browsing for a good product. We will see if the MC851 unit can perform as well as Xigmatek claims it does in this review.

Manufacturer’s Features and Specifications

  • Multiple +12V Output: Enhanced +12V current capability broadens utilization possibilities.
  • High Efficiency (up to 87%): Optimal solution for lower energy consumption, noise, and heat. 
  • Active Power Factor Correction (0.99 PFC): Reduce line loss & power distortion. 
  • Double Forward Circuit Design: Increase the reliability and efficiency of power.
  • Universal AC Input (Full Range): Plug & run safely anywhere in the world. 
  • Smart and Silent Fan Control: Smart thermal control to balance noise and cooling.
  • 13.5(14)cm Cooling Fan: Maximum airflow, minimum noise level and extra durable life. 
  • PCI-Express Connector: Support new PCI-E connectors for Video Card. 
  • Patented Easy Swap Connector: Unplug connectors easily & quickly.
  • Cable Management Swap Connector: Improve messy cable problem. With cable management swap connector. 
  • PC Power Supply Design Guide: Support ATX / BTX / EPS. 
  • Multiple Platforms: Capability for Intel / AMD platforms. 
  • Output Protection: Completed protection OVP / OCP / OPP / UVP / SCP / OTP.
  • Mesh Sleeve Cable Design: Make cable management easier & airflow efficient. 
  • Honey Comb Structure
  • Japan Electric Capacity
Product Name
Product Number
150mm(L) x 160mm(W) x 86mm(H)
ATX Logic on-off additional power rocker switch
Power Factor
PF > 0.9
Cooling System
140mm Fan, 2300RPM±10%
16 dBA at 1300RPM
Up to 87%
Hold-up Time
16 ms

Input Voltage
Input Frequency Range
120,000 hrs minimum (at 25°C)
Input Current
100Vac/13A max

Regulation *1
Ripple & Noise *2
+3, -3%
+3, -3%
+3, -3%
+3, -3%
+3, -3%
+3, -3%
+9, -5%
+3, -3%
Total Power
+5Vsb operate at 3.0A max load base on PS-ON mode.
http://www.xigmatek.com/uppics/dot.gifIf PS-OFF +5Vsb only operate at 3A max load.
Add 0.1µF capacitors across output terminal during ripple & noise test.

Operating Temp.
10°C to 50°C
Storage Temp.
-20°C to 70°C
Operating Humidity
20% to 90%, non-condensing
Storage Humidity
5% to 95%, non-condensing

DC Rail
Trigger Point/Range
Over Voltage Protection
+3.3V trip point
4.5 Vmax
+5.0V trip point
7.0 Vmax
+12.0V trip point
15.6 Vmax
Over Current Protection
Not over 240VA for every output voltage
Short Protection
All output to GND

Packaging and Bundle

The packaging of the NRP-MC851 unit is not very fancy, but it draws attention and it is very sturdy. The unit inside could have been better protected as there isn’t anything besides a bubble bag protecting the PSU, but the thick walls of the cardboard box should keep it safe. The grey exterior of the cardboard box could even be used as a magazine or paper holder. Inside the package you will find a couple of pouches for storing the cables you aren’t going to use, a detailed manual, typical 3M screws, a couple of cable ties and a warranty card. There is also a bag with all of the modular cables inside. All of the cables share the same red-black sleeving and have coloured connectors depending on their type.

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