Gaming - MBP runs too hot
As per Intel's site, the maximum temperature for this CPU is 100 C.  I wouldn't be immediately concerned unless your machine is freezing / shutting down, or showing video artifacts.

Obviously 80 C is still pretty warm; you can try some things to bring it down.


Active cooling pad/base with fans built in
Cleaning out the CPU fan and exhaust vents.  This
requires taking off the bottom cover.
Using iStats or another program to run the fan at a higher speed.