Corsair offers a large selection of PC power supplies and today we will be taking a detailed look at their new RM850i PSU. The RMi Series includes four models: the RM650i, RM750i, RM850i, and RM1000i. As you can see in the diagram below, the RMi Series is located squarely in the middle of Corsair’s power supply lineup. Corsair currently offers thirty four different models ranging from the 350 watt VS350 all the way up to the king-of-the-hill 1,500 watt AX1500i.
The new Corsair RMi Series power supplies are equipped with fully modular cables and optimized for very quiet operation and high efficiency. RMi Series power supplies incorporate Zero RPM Fan Mode, which means the fan does not spin until the power supply is under a moderate to heavy load. The cooling fan is custom-designed for use in PSUs to deliver low noise and high static pressure. All of the RMi Series power supplies are 80 Plus Gold certified for high efficiency.
The Corsair RMi series power supplies are 80 PLUS Gold certified and deliver 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. Corsair Link Digital makes it easy to monitor power supply performance, toggle single rail or multi rail mode, and control fan speed directly from your desktop.
Little appears to have changed on the outside as the RM-based PSUs occupy what appears to be an identical chassis measuring 180mm x 150mm x 86mm. Both feature fully-modular cabling, Corsair Link compatibility and a fan that only turns on once load has reached approximately 40 per cent of total capacity, or 340W in our case. The firm reckons this remains true if the ambient temperature is 25°C or less.
There's a fair chance the fan will never switch on in a modern PC housing a single graphics card; our test system equipped with a reference GTX 980 Ti doesn't reach this figure at the wall. It's no surprise that Corsair has a prominent label pre-attached that informs the user the fan is supposed to remain off at low loads - this has been a cause of unnecessary RMA returns in the past. There's a fairly linear ramp in fan speed once 40 per cent is breached, and Corsair reckons it never goes above 21dBA in its own internal testing.
Corsair RM850i PSU Features summary:
• 850W continuous DC output (up to 50°C)
• 7-Year Warranty and Comprehensive Customer Support
• 80 PLUS Gold certified, at least 90% efficiency under 50% load
• Corsair Link ready for real-time monitoring and control
• Ability to switch between single and multiple +12V rails
• Fully modular cables for easy installation
• Zero RPM Fan Mode for silent operation up to 40% load
• Quiet fluid dynamic fan bearing for long life and quiet operation
• High quality components including all Japanese electrolytic capacitors
• Active Power Factor correction (0.99) with Universal AC input
• Safety Protections : OCP, OVP, UVP, SCP, OTP, and OPP
To view full Specifications visit the website at: