08-08-2020, 08:49 AM
Hello,
Sorry for late answer. I was trying to retrieve my notes from the test. Unfortunately, unsuccessful. So I repeat from my memory.
I used two TMP36 temperature sensors. One attached to RAM, one – to the CPU. Both were read by two analog channels of Arduino PRO Mini. In addition, I checked temperature of CPU delivered by /sys/class/thermal/thermal_zone0/temp (and ... thermal_zone1... ). I had to attach external sensor to a RAM since I do not know about any internal sensor reading RAM temperature.
Ambient temperature was between 18 and 19 Celsius, but not really controlled. Just room temperature in winter here in Germany. The board was simply supported on corners, on a table – no case.
Temperature data from all sensors was collected every 8 seconds, and stored in a plain file, together with a time stamp. Unfortunately, I cannot find these files anymore. Aim of the test was to decide whether I need cooling of the RAMs, so after the decision I have not cared of the data.
I executed 3 tests:
- CPU load with stress -c 6 -t <several minutes>
- CPU load with stress -c 6 -t <several minutes>, plus playing high quality video
- Memory load with stress -m 6 -t <several minutes>
Since I could not attach sensor to RAM with the heat sink mounted to CPU. The test was done without it. The second sensor was attached to CPU, but it cannot dissipate heat significantly. Despite of that, CPU has not reached 80 Celsius during the test.
I remember that temperature shown by the sensor attached to CPU was few degrees lower than the internal sensors value. The difference between temperature read from RAM and from CPU was varying, but never less than 20 degrees of Celsius. Also they were heating and cooling with different speed.
Now, when you asked this question again, I realized that the CPU temperature with attached heat sink is much lower than during my measurement. So it would be very interesting to check the RAMs temperature with the heat sink on CPU. I will try to attach a temperature sensor to RAM somehow. TMP36 seems too big for this purpose. I need to find some way... And it is summer here. Air in that room where ROCKPro is located is terribly hot – around 27 Celsius.
Best regards,
Gienek.
Sorry for late answer. I was trying to retrieve my notes from the test. Unfortunately, unsuccessful. So I repeat from my memory.
I used two TMP36 temperature sensors. One attached to RAM, one – to the CPU. Both were read by two analog channels of Arduino PRO Mini. In addition, I checked temperature of CPU delivered by /sys/class/thermal/thermal_zone0/temp (and ... thermal_zone1... ). I had to attach external sensor to a RAM since I do not know about any internal sensor reading RAM temperature.
Ambient temperature was between 18 and 19 Celsius, but not really controlled. Just room temperature in winter here in Germany. The board was simply supported on corners, on a table – no case.
Temperature data from all sensors was collected every 8 seconds, and stored in a plain file, together with a time stamp. Unfortunately, I cannot find these files anymore. Aim of the test was to decide whether I need cooling of the RAMs, so after the decision I have not cared of the data.
I executed 3 tests:
- CPU load with stress -c 6 -t <several minutes>
- CPU load with stress -c 6 -t <several minutes>, plus playing high quality video
- Memory load with stress -m 6 -t <several minutes>
Since I could not attach sensor to RAM with the heat sink mounted to CPU. The test was done without it. The second sensor was attached to CPU, but it cannot dissipate heat significantly. Despite of that, CPU has not reached 80 Celsius during the test.
I remember that temperature shown by the sensor attached to CPU was few degrees lower than the internal sensors value. The difference between temperature read from RAM and from CPU was varying, but never less than 20 degrees of Celsius. Also they were heating and cooling with different speed.
Now, when you asked this question again, I realized that the CPU temperature with attached heat sink is much lower than during my measurement. So it would be very interesting to check the RAMs temperature with the heat sink on CPU. I will try to attach a temperature sensor to RAM somehow. TMP36 seems too big for this purpose. I need to find some way... And it is summer here. Air in that room where ROCKPro is located is terribly hot – around 27 Celsius.
Best regards,
Gienek.