| AMDZENTEMP(4) | Device Drivers Manual (x86) | AMDZENTEMP(4) | 
amdzentemp —
amdzentemp* at amdsmnbus?
amdzentemp driver provides support for the on-die
  digital thermal sensor present on AMD Ryzen CPUs and some later AMD Opteron
  CPUs.
These sensors provide 0.125°C accuracy. There is one sensor for each CPU socket.
The amdzentemp driver reports temperatures
    through the envsys(4)
  API.
| Sensor | Units | Typical Use | 
| CPUN sensor0 | μK | cpuN temperature | 
amdzentemp driver first appeared in
  OpenBSD 4.4 named “kate”. It was then
  ported to NetBSD 5.0 under the name
  amdtemp(4). The
  FreeBSD version of the driver was updated with support
  for newer AMD CPUs. For NetBSD, the support for the
  newer CPUs was separated into its own amdzentemp
  driver.
amdzentemp driver was written by
  Constantine A. Murenin
  <cnst@openbsd.org>
  whilst at the University of Waterloo. Porting of support for the newer AMD
  CPUs from FreeBSD was provided by Ian
  Clark.
The sensor has a thermal-trip value which should be retrieved and provided to envsys(4) as the sensors critical-maximum value.
| April 20, 2020 | NetBSD 9.4 |