Thanks @sparklepimp! I opened a 1080 60 fps video on YouTube, using Safari and the temperatures went to 60 ºC or a bit higher, with the fans running around 4000 to 5000rpm or above (and I heard it), then opened the Activity Monitor to see what was happening. Now it’s night here and the ambient temperature is lower.
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I bought it on a store called PcDiscount here in Argentina. They say they have “refurbish certificate”. It seems not.
I tried to opened it to see the thermal paste or the cooler condition, but they put a warranty warning over one of the screws. Should I tell them this situation? Or you consider this normal? Thanks for this and for my english too! :)