I have a Samsung series 5 my temperature is around 77-80°c when i am playing, and 48-54 on normal use it laptop don't have a month and I am not sure if it is normal.
Intel® Core™ i5-3210M CPU @ 2.50GHz × 4
8 GB of RAM
Nvidia optimus 650M (I am using Bumblebee)
Ubuntu 12.04