Corsair PSU Center

An iCUE-style dashboard for Corsair HXi / RMi digital power supplies, running as a native Unraid plugin.

Corsair's own iCUE software is Windows-only, so a Corsair digital PSU in an Unraid server normally means no monitoring and no fan control at all. This plugin adds both, in its own tab.

Status: working and in daily use on an ASUS X299 / Unraid 7.2.7 box with an HX1000i. Only that model has been tested on real hardware — the other eleven are supported by the same detection path but are, honestly, untested. Reports welcome.

Features

Live monitoring — read from the kernel's corsair-psu hwmon driver, so polling costs no USB traffic and cannot collide with anything else talking to the PSU:

• Per-rail voltage, current and power for +12V, +5V and +3.3V
• Total power out, estimated power in, efficiency, load %
• VRM and case temperatures, fan RPM
• Every tile carries a running min/max and a live sparkline

Fan control

• Default — hand the fan back to the PSU's own firmware (zero-RPM idle)
• Fixed % — hold a constant duty, 30–100%
• Custom curve — drag-and-drop curve editor mapping VRM temperature to fan duty
• Presets: Quiet, Balanced, Performance, Max

+12V OCP rail mode — toggle between single-rail and multi-rail overcurrent protection. Single rail uses one combined threshold for the whole +12V output, which means fewer nuisance trips when several drives spin up at once.

Adjustable text size — the whole UI scales from one control, remembered per browser.

Supported hardware

Any PSU handled by the kernel corsair-psu driver. The model is detected at runtime from its USB HID product id — nothing is hardcoded.

An unrecognised Corsair PSU still works for everything the kernel exposes (rails, power, temperatures, fan, and fan control). Only efficiency, input power and load % are hidden, because those need model-specific coefficients — the plugin will show n/a rather than invent a number.

Requires Unraid 6.12.0 or newer.

Install

Unraid → Plugins → Install Plugin, paste the URL of corsairpsucenter.plg, and click Install. Then open the CorsairPSUCenter tab in the top menu.

The package is self-contained: it bundles every Python module it needs. No pip, no internet access at install or boot, and nothing to configure by hand. Unraid re-runs the .plg on each boot, so it survives reboots on its own.

To remove it, use the Plugins page. Uninstall stops the fan service, hands the fan back to the PSU firmware, and removes everything it installed.

How it works

Two deliberately separate paths:

• Telemetry → sysfs. The kernel corsair-psu hwmon driver publishes all sensors under /sys/class/hwmon/hwmonN/. Reading them is instant, involves no USB traffic, and cannot conflict with other software.
• Control → USB HID via liquidctl. Required, because the kernel driver exposes pwm1 and pwm1_enable read-only — there is no write path through sysfs. Only the two write operations (fan duty, OCP mode) go over USB, targeted by vendor and product id.

Efficiency and input power are estimates. The PSU does not report input power, so it is derived from a per-model quadratic fit of output power, interpolated for mains voltage. The coefficients come from liquidctl's corsair_hid_psu driver.

Why a background service for the fan curve

These PSUs cannot store a fan curve in firmware — set_speed_profile is NotSupportedByDevice for this family; the hardware only accepts a single fixed duty. iCUE on Windows works around this by polling temperature and rewriting the duty, and this plugin does the same: a small daemon reads VRM temperature every 10 seconds and re-applies the appropriate duty, writing only when the value actually changes.

Consequences worth knowing:

• Minimum duty is 30%. liquidctl clamps below that.
• Curve mode depends on the service running. The UI tells you if it isn't.
• Choosing Default stops the service and returns control to the PSU.

Support

Unraid forum support thread — best place for questions, problems, or to report how it behaves on your hardware. GitHub issues work too if you'd rather report there.

Reports from other PSU models are especially welcome. Only the HX1000i has been tested on real hardware; the other eleven share the same detection path but nobody has confirmed them yet. If you run one, it's useful to know whether the model name, wattage and efficiency read correctly.

Layout

corsairpsucenter.plg     the installer
archive/                 the .txz package + its md5
src/                     readable sources (also inside the package)
  api.php                telemetry + control endpoint
  fand.sh                fan curve daemon
  CorsairPSUCenter.page  the UI
ca_profile.xml           Community Applications repository profile
plugins/                 Community Applications plugin template

Credits

Device protocol, model table and efficiency coefficients come from liquidctl, which does the hard part of talking to these PSUs. The corsair-psu hwmon driver is part of the Linux kernel.

License

GPL-2.0, matching liquidctl and the Unraid plugin ecosystem.