Two different CPU temps

[Philipp_1]

Hello,

I recently bought a Ryzen 2600X and i cool it with a be quiet! Pure Rock on an ASUS prime B350 Plus.
As I was monitoring the temps while stress testing, I noticed a 10°C+ difference in CPU temps with the CPU sensor and the motherboard sensor. Strangely, this difference does not occur while the CPU is in idle.
Temps monitored by HWiNFO64:

Idle:
CPU (Tctl/Tdie) 45.5°C
CPU (Mainboard) 45°C
Stressed:
CPU (Tctl/Tdie) 87.0°C
CPU (Mainboard) 75°C

Any idea what is the real temperature, and how I fix it? Since the motherboard temperature is regulating the CPU PWM Fan, I am concerned about to high temps.


Everything in Stock settings.

 

[racksmith101]

There is usually a difference between the two readings at higher temperatures. The mobo sensor is under the CPU whilst the CPU sensor is actually on the CPU itself. Your temps are a bit high on idle (depends on the ambient air temp where you are) and very high on full load. You might want to adjust your fan settings for the CPU and case fans, or get some better case fans to improve the air flow.

 

[Philipp_1]

The mobo sensor is under the CPU whilst the CPU sensor is actually on the CPU itself

So the CPU sensor is the one I should be looking at?

You might want to adjust your fan settings for the CPU and case fans, or get some better case fans to improve the air flow.

Got a be quiet! Pure Base 600 with 2x140mm Pure Wings 2 in the front and 1x120mm Pure Wings 2 in the back.
The Pure Rock CPU cooler has 1x120mm Pure Wings 2, though vertically mounted due to AM4. So the Cooler blows air to the top and takes warm air from the GPU. Playing games, the CPU as well as the GPU both settle at ~70°C, which I figured as cool enough.

Any suggestions?