Temperature and memory ram

Hi guys! Recently bought a galaxy s6, and I see that the ram memory consumption is quite high, it remains only a 400/500 mb for use, it is normal? And when I play a game that needs a lot of processor, it reaches 72 temperature. It is normal?
I'm brasilian, my s6 My s6 has the bootloader g920idvu1a0e3 and this firmware is 5.0.2 official.