Corsair RM850x V2 PSU Review: Smaller And Quieter!

Teardown & Component Analysis

Before proceeding with this page we strongly encourage you to a look at our PSUs 101 article, which provides valuable information about PSUs and their operation, allowing you to better understand the components we're about to discuss.

There are a few differences between this PSU and the previous-generation RM850x. For starters, a bypass relay supports the NTC thermistor, allowing for increased efficiency and enhanced inrush current protection. On the primary side, CWT decided to swap out the Vishay FETs for Infineon ones. Both brands are good; however, Infineon products are more popular in high-end PSUs.

The bulk caps are exactly the same as Corsair's older RM850x. There was no reason to change them, since this PSU's hold-up time satisfies the ATX spec's requirements. Both the APFC and LLC resonant controllers are provided by Champion now, whereas the previous-gen RMx units used Infineon controllers.

On the PSU's secondary side, changes are limited to the DC-DC converters. Corsair's updated design uses six QM3006D FETs rather than a combination of four QM3004D and two QM3006D FETs. Moreover, the fan control circuit employs a microcontroller that facilitates fine tuning of the fan's profile.

In general, this is a very good platform with compact dimensions that don't seem to negatively affect performance. Despite the lack of proper heat sinks on the secondary side, Corsair's semi-passive mode lasts a long time. On top of that, its fan profile is relaxed, even under tough conditions. This means that the platform is designed well, even in the face of limited airflow.

Image 1 of 33

Here are some photos showing the PSU’s major parts.

The following video shows the RM850x’s internals.

MORE: Best Power Supplies

MORE: How We Test Power Supplies

MORE: All Power Supply Content