On the subject of "cooler": Temperatures are in all 3 sheets about 3 ° C higher (with no airflow, previously behind fan).
But that's why they were not bought, but because my 3 panels have brought to hum the case, what was unbearable in the long run!
Now you can hear absolutely no hum more, only the running noise can be heard even (a little quieter). Therefore only 4 stars, but real alternatives are no longer so easy to get :(