Hi,
Got myself two hex routers, RB750Gr3…they run the same config/software release, yet one is approaching 60 degrees C where another barely registers 31…
No idea what is wrong, CPU is barely used etc…
Mine is at 35-ish too. These are low power devices, should be quite cool.
Maybe the sink isn’t sitting properly: http://forum.mikrotik.com/t/new-cpu-new-product-rb750gr3-rb750g-family-now-mmips/102198/1
Same location? Not stacked? Same airflow opportunities?
If same location, swap positions. See if heat follows device or position.
Does if feel warmer to the touch?
Mine idle on 20 celsius.