---
name: "itherm"
section: "4"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["openbsd"]
url: "https://new.carta.tech/itherm"
---

# itherm(4)

Intel 3400 temperature sensor

## NAME

**itherm** – Intel 3400 temperature sensor

## SYNOPSIS

**itherm\* at pci?**

## DESCRIPTION

The **itherm** driver provides support for several sensors found in Intel 3400 and 5 series chipsets.

The sensors currently exposed via the [sysctl(8)](/sysctl/8.md) interface are:

| | | |
| --- | --- | --- |
| **Sensor** | **Units** | **Typical Use** |
| Thermometer | degC | Temperature |
| Core 1 | degC | Temperature |
| Core 2 | degC | Temperature |
| CPU power cons. | Watts | Power usage |
| CPU/GPU Max | degC | Temperature |
| DIMM 1 | degC | Temperature |
| DIMM 2 | degC | Temperature |
| DIMM 3 | degC | Temperature |
| DIMM 4 | degC | Temperature |
| GPU abs. | degC | Temperature |
| PCH abs. | degC | Temperature |

## SEE ALSO

[pci(4)](/pci/4.md), [sensorsd(8)](/sensorsd/8.md), [sysctl(8)](/sysctl/8.md)

## HISTORY

The **itherm** driver first appeared in OpenBSD 4.8.

## AUTHORS

The **itherm** driver was written by Mike Larkin ⟨*mlarkin@openbsd.org*⟩.

## CAVEATS

Not all sensors are wired on every machine, so the list of sensors shown in [sysctl(8)](/sysctl/8.md) may not show all the sensors listed above. Furthermore, the **itherm** driver will flag sensors as invalid if they report bogus data.