4.8 KiB
Corsair HXi and RMi series PSUs
Driver API and source code available in liquidctl.driver.corsair_hid_psu.
Changed in 1.12.0: HX1500i and HX1000i 2022 re-issue are now also supported.
Initialization
It is necessary to initialize the device once it has been powered on.
# liquidctl initialize
The +12V rails normally functions in multiple-rail mode, and initialize will
by default reset the PSU to that behavior. Single-rail mode can be optionally
selected by passing --single-12v-ocp to initialize.
Changed in 1.9.0: changing the OCP mode or resetting to hardware fan control
is not available when the device was initialized by the Linux hwmon driver.
Monitoring
Changed in 1.9.0: OCP and fan control modes, as well current and total uptime,
are not available when data is read from Linux hwmon.
The PSU is able to report monitoring data about its own hardware and basic electrical variables for the input and output sides.
# liquidctl status
Corsair RM650i
├── Current uptime 3:43:54
├── Total uptime 9 days, 11:43:54
├── VRM temperature 50.0 °C
├── Case temperature 40.8 °C
├── Fan control mode Hardware
├── Fan speed 0 rpm
├── Input voltage 230.00 V
├── +12V OCP mode Multi rail
├── +12V output voltage 12.12 V
├── +12V output current 7.75 A
├── +12V output power 92.00 W
├── +5V output voltage 4.97 V
├── +5V output current 2.88 A
├── +5V output power 14.00 W
├── +3.3V output voltage 3.33 V
├── +3.3V output current 1.56 A
├── +3.3V output power 5.00 W
├── Total power output 110.00 W
├── Estimated input power 124.00 W
└── Estimated efficiency 89 %
Input power and efficiency are estimated from efficiency data advertised by Corsair in the respective HXi and RMi PSU user manuals.
These estimates are not accurate at load levels bellow 10%, in particular with the HX1500i and the 2022 re-issue of the HX1000i.
Changed in 1.11.0: temperature sensors 1 and 2 have been renamed to VRM and
case, respectively.
Fan speed
The fan speed is normally controlled automatically by the PSU. It is possible to override this and set the fan to a fixed duty value using the fan channel.
# liquidctl set fan speed 90
This changes the fan control mode to software control and sets the minimum allowed duty value to 30%. To revert back to hardware control, re-initialize the device.
Appendix: differences in efficiency data
HXi and RMi power supply units do not report input power or current to the host. Yet, the efficiency data in the user manuals can sometimes result in more conservative estimates that the input power and efficiency values iCue and CorsairLink display.1
We believe that this is the result of the use, in those programs, of a different set of efficiency curves, based on internal and unpublished testing. Additionally, the manuals also do not match publicly available data submitted for the 80 Plus certification of these PSUs.2 Unfortunately, the latter is only available for 115 V input.
At this point it is important to remember that efficiency, and consequently power draw, are functions of more than just the total power output. Thus, the data in the user manuals is probably significantly less precise than it appears to be, and we believe the same could be true for the values displayed by iCue and CorsairLink.
Still, we encourage Corsair to make more of its efficiency data public, which would hopefully allow liquidctl to present more precise estimates.
1 See comments in issue #300.
2 Available at 80 PLUS® Certified Power Supplies and Manufacturers.
Interaction with Linux hwmon drivers
New in 1.9.0.
These devices are supported by the mainline Linux kernel with its
corsair-psu driver, and status data is provided through a standard hwmon
sysfs interface.
Starting with version 1.9.0, liquidctl automatically detects when a kernel
driver is bound to the device and, whenever possible, uses it instead of
directly accessing the device. Alternatively, direct access to the device can
be forced with --direct-access.