Reading Temperature_target Directly From Cpu

I would like to directly read the minimum temperate at which the TCC will be activated from the TEMPERATURE_TARGET register in my Intel i7-5930k. The Socket Thermal Guide (http://w

Solution 1:

It depends on the OS.

On linux, you can read it using rdmsr (read model specific registers)

On ubuntu, you could try something like the following:

sudo apt-get install msr-tools
sudo modprobe msr
sudo rdmsr --bitfield 15:8 -c 0x00001a2
sudo rdmsr --bitfield 23:16 -c 0x00001a2

Returns 0x12 and 0x69 on my machine.

Explanation

From the Thermal Mechanical Design Guidelines (page 20):

1. Temperature Control (T_CONTROL ) Offset: MSR (1A2h) TEMPERATURE_TARGET[15:8]
2. TCC Activation Temperature: MSR (1A2h) TEMPERATURE_TARGET[23:16]

• 0x00001a2 is the register number.
• The first rdmsr command reads the field Temperature Control Offset.
• The second rdmsr command reads the field TCC Activation Temperature.