Introduction

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	NRP-MC851
Product Number	CPH-0850U-CO1
Power	850W
Dimension	150mm(L) x 160mm(W) x 86mm(H)
Switches	ATX Logic on-off additional power rocker switch
Power Factor	PF > 0.9
Cooling System	140mm Fan, 2300RPM±10%
Noise	16 dBA at 1300RPM
Efficiency	Up to 87%
Hold-up Time	16 ms

INPUT
Input Voltage	100-240VAC
Input Frequency Range	47~63Hz
MTBF	120,000 hrs minimum (at 25°C)
Input Current	100Vac/13A max

OUTPUT
	Max/Min	Regulation *1	Ripple & Noise *2	Output
+5V	30A/0.5A	+3, -3%	50mV	180W
+3.3V	30A/0.5A	+3, -3%	50mV
+12V1	18A/1A	+3, -3%	240mV	744W
+12V2	18A/1A	+3, -3%	240mV
+12V3	30A/1A	+3, -3%	240mV
+12V4	30A/1A	+3, -3%	240mV
-12V	0.8A/0A	+9, -5%	120mV	9.6W
+5Vsb	3.0A/0A	+3, -3%	50mV	15W
Total Power	850W
+5Vsb operate at 3.0A max load base on PS-ON mode. If PS-OFF +5Vsb only operate at 3A max load. Add 0.1µF capacitors across output terminal during ripple & noise test.

Environment
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

Protection
	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.