Too hot for my macbook pro retina 15 2013 late

I bougt my macbook pro retina 15 2013 late 2 days ago,
I found it is easily to be in high temprature.
I extended 2 external monitors for my mac , is it the reason to make my mac so hot?
the most cpu usage is idle.

Welcome to Apple Support Communities
When you connect an external display, the dedicated GPU is used. This GPU generates more heat and needs more power, being this probably the reason why your Mac is hot. It also depends on the applications you use, but in this case, I do not find any application that takes a lot of processor and RAM.
Anyway, those temperatures are still not dangerous. Fans should be working to decrease the temperature.

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