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/goal — Temperature Sensor Suite

Goal

Build a lightweight hardware temperature monitoring library for the user's AMD Ryzen 5 4500 (Zen 2 / Renoir). Read all available temperature sensors via WinRing0 ring-0 access. No WMI, no heavy dependencies, just raw hardware registers.

Hardware

Component Value
CPU AMD Ryzen 5 4500
Arch Zen 2 / Renoir (Family 17h Model 60h)
Cores 6C / 12T
Driver WinRing0x64.sys (OpenHardwareMonitor)

Available Temperature Sensors

Via WinRing0 (ring-0)

# Sensor Register Type Status
1 CPU Package (Tctl) SMN 0x00059800 Package Done — 50.1 C
2 CCD 0 temp SMN 0x00059954 Per-CCD Tested — unavailable on Renoir
3 CCD 1 temp SMN 0x00059958 Per-CCD Tested — unavailable on Renoir
4 CPU Core Voltage (VDDCR_CPU) SMN 0x0005A010 (SVI2 Plane0) Voltage Implemented — returns 0 on Cezanne APU (telemetry not exposed)
5 SoC Voltage (VDDCR_SOC) SMN 0x0005A00C (SVI2 Plane1) Voltage Implemented — returns 0 on Cezanne APU (telemetry not exposed)
6 CPU Package Power SVI2 V*I estimate Power Implemented — returns 0 on Cezanne APU (telemetry not exposed)

Other Temperature Sources (future work)

# Sensor Method Difficulty
4 NVMe SSD temp SMART via IOCTL_STORAGE_QUERY_PROPERTY Easy
5 Motherboard temp Super I/O chip via IO ports Hard
6 GPU temp NVML (NVIDIA) or ADL (AMD) Medium

Build & Run

# Build
cmake -S F:\Coding\sensors-test\libhwsense -B F:\Coding\sensors-test\libhwsense\build -G "Visual Studio 17 2022" -A x64
cmake --build F:\Coding\sensors-test\libhwsense\build --config Release

# Run (as Administrator)
F:\Coding\sensors-test\libhwsense\build\Release\read_cpu_temp.exe

Milestones

  • v0.1 — CPU Tctl via SMN (AMD) and MSR (Intel)
  • v0.2 — CCD per-die temps — confirmed unavailable on Renoir (Family 17h Model 60h)
  • v0.3 — AMD SVI2 voltages (Core VDD + SoC voltage) — implemented, SVI2 telemetry not exposed on Ryzen 5 4500
  • v0.4 — Intel Core Voltage (MSR 0x198) + Package Power (RAPL sysfs) — tested on homelab i5-1235U
  • v0.5 — AMD Package Power (SVI2 V*I estimate) — implemented, hardware-dependent
  • v0.6 — NVMe SSD temperature — implemented via IOCTL_STORAGE_QUERY_PROPERTY
  • v0.7 — Motherboard Super I/O temps — implemented NCT6775/NCT6798 via IO ports
  • v0.8 — GPU temperature — implemented via NVML (NVIDIA) + ADL (AMD)

Notes

  • AMD Renoir (Model 0x60) has fewer exposed sensors than Matisse (0x71)
  • CCD temps at SMN 0x00059954 are documented for Matisse — need to test on Renoir
  • The library is already very lightweight: one DeviceIoControl call per sensor reading
  • No per-core temps on AMD — Tctl is package-level only (all cores share one reading)