Corsair RM850x 80 PLUS Gold, 850 Watts, Fully Modular ATX Power Supply Unit - Black £125.00 at Amazon
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Corsair RM850x 80 PLUS Gold, 850 Watts, Fully Modular ATX Power Supply Unit - Black £125.00 at Amazon

£125Amazon Deals
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441°
Corsair RM850x 80 PLUS Gold, 850 Watts, Fully Modular ATX Power Supply Unit - Black £125.00 at Amazon
Posted 14th Jan 2021
Update 1
Update - price drop from £129.99 to £125 on 15/01
A Tier PSU: in stock + additional 2yr warranty (=better reliability) + better capacitors over the non-x "RM850" for £15/ 13% more than Amazon's price (also listed here prior to price creep).

Limited audience for those daft enough to be PC building during the lockdown's crazy prices. 850W is a good capacity for those waiting patiently for a reasonably priced 3080 (100W over the minimum requirement). I've read reports of some (not specifically RMx PSUs) having problems @ 750W.

I have also read that the RMx fans are quieter than the RM's, but this contradicts the Corsair blurb which indicates they are the same. Can any PC builders clarify?

"The RMx ostensibly replaces the RM in Corsair's power supply line up. The RMx features the same 135mm rifle bearing fan as the RM, with a "Zero RPM" mode that keeps the fan from spinning, therefore completely silent, at loads under 40%. The RMx is 80 Plus Gold and is fully modular, but other than this the RMx has quite a few upgrades over the RM.

The RMx features all Japanese capacitors, rated at 105°C. This upgrade allows the PSU to run at full load, continuously, in environments as high as 50°C. For this reason, we've increased the warranty for the RMx from five years to seven years.

The cable set for the RMx is much like the RMi's. They utilize the new “Type 4” cables. The 6-pin cables (for SATA and peripheral power) are identical to the Type 3 cables used previously (HXi, RM, etc.). But the 8-pin cables (for ATX12V/EPS12V and PCIe) have added capacitors to help reduce the ripple noise on these leads. Furthermore, the Type 4 24-pin has an additional four pins, as well as the added capacitors. These extra leads are sense wires that allow the RMx to sense the voltage at the load and adjust accordingly to improve voltage regulation.

All of the power supplies in the Corsair RMx Series have the necessary protection functions to ensure trouble-free operation, even in extreme conditions. Below is a list of the included protections:

  • Over Current Protection (OCP): Shuts off power if any rail is overloaded beyond a safe level.
  • Over Voltage Protection (OVP): Shuts off power if voltages exceed specification.
  • Under Voltage Protection (UVP): Shuts off power if voltages drop below specification.
  • Short Circuit Protection (SCP): Shuts off power if a short circuit is detected.
  • Over Temperature Protection (OTP): Shuts off powerif temperatures exceed a specified value.
  • Over Power Protection (OPP): Shuts off power if the total output power exceeds a safe level."
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