ROG G771 Series N751JM - Are my CPU/GPU temperatures are too high?

[AbramsM1A2]

I have now this laptop for almost a year, all the time i used to play ocasionally light games like super meat boy. But now playing Mad Max, the laptop temperatures -->CPU= 80º-90º and the GPU=80º. I think they are too high. Are the temperatures normal?
What can i do?, should I get a cooler?, or is a dust problem?

Sry for my english.