Corsair RM850x (2018) power supply review

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Certification, Specs and Features

Energy efficiency certification

Corsair offers the RMx series PSUs as a Gold rated power supply as certified by the 80 PLUS organization (the people that certify and test efficiency). We already explained a little what that literally means. But what does such a certification entail? Well, 80 Plus (trademarked 80 PLUS) is a voluntary certification program intended to promote efficient energy use in computer power supply units (PSUs). Launched in 2004 by Ecos Consulting, it certifies products that have more than 80% energy efficiency at 20%, 50% and 100% of rated load, and a power factor of 0.9 or greater at 100% load. That is, such PSUs will waste 20% or less electric energy as heat at the specified load levels, thus reducing electricity use and bills compared to less efficient PSUs. Sometimes, rebates are given for manufacturers who use 80 Plus-certified PSUs.

 
 

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But there is plenty to choose from, we have standard 80plus, Bronze, Silver, Gold, Platinum, and even Titanium certifications. A PSU that is certified 80 PLUS Gold or 80 PLUS Platinum is more efficient than your regular unit. Todays tested PSU is certified by the 80 PLUS organization to deliver a 90% energy efficiency at 50% load (USA) and 92% efficiency when your PC at 230 Volts (EU) based on 50% load. These units have active PFC with a power factor up to 0.99 and obviously are ErP compliant with a standby power drain below 0.12 watts.

Power consumption for your PC has dropped over the years with all new technologies. These days with a mainstream to high-end PC we recommend a 600~650 Watt PSU really, that is including the usage of a single high-end graphics card. We mention this because your PC / PSU is the most efficient and energy friendly at half its load, sometimes it might even be wise to get a higher rated power supply. The model tested today is most efficient at 425 Watts, which is pretty much what an enthusiast class slash powerful PC with a high-end graphics card uses during a game of hefty fragging.


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Corsair RM850x Fully Modular Power Supply

AC Input Rating DC Output Rating
AC Input: 100V - 240V DC Output +3.3V +5V +12V -12V +5Vsb
Current: 10A - 5A Max Load 25A 25A 70.8A 0.8A 3A
Frequency: 47Hz - 63Hz Maximum Combined Wattage 150W 850W 9.6W 15W
Total Power: 850W
 
 

Corsair RMx series power supplies are 80 PLUS Gold certified and give you extremely tight voltage regulation, virtually silent operation, and a fully modular cable set. With all Japanese 105°C capacitors, they’re a great choice for high-performance PCs where reliability is essential. 

Package contents

  • RMx Series High-Performance ATX Power Supply
  • AC power cord
  • DC Modular cable set
  • DC Modular cable storage bag
  • Cable ties
  • Corsair case badge
  • User Manual

Compatibility

  • Intel Core processor and AMD Ryzen Ready
  • ATX12V v2.4 and EPS 2.92 standards and is backward compatible with ATX12V 2.2, 2.31 and ATX12V 2.01 systems

Features

  • 80 PLUS Gold Certified: High efficiency operation for lower power consumption, less noise and cooler temperatures.
  • Tuned for Low Noise Operation: A specially set fan curve ensures that, even at full load, fan noise is kept to a minimum.
  • Zero RPM Fan Mode: At low and medium loads the cooling fan switches off entirely for near-silent operation.
  • 100% All Japanese 105°C Capacitors: Premium internal components ensure unwavering power delivery and long-term reliability.
  • Fully Modular Cables: Only connect the cables your system needs, making clean and tidy builds easier.
  • Compact Size: A 160mm-long casing ensures an easy fit in almost all modern enthusiast PC cases. (RM550x, RM650x, RM750x, RM850x)
  • Compact Size: A 180mm-long casing ensures an easy fit in almost all modern enthusiast PC cases. (RM1000x)
  • Ten-Year Warranty: Your guarantee of reliable operation that will last across several system builds.

The RMx Series allows for the fan to remain off at low to medium loads for virtually silent operation. And when you’re pushing it hard, the thermally controlled fan adjusts its speed to provide optimal cooling with minimal noise.

This 850W model can be spotted at a street price of roughly €135,- / $139,-


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