Here are the features of the CPU:
It all depends on what type of game you are playing?
Check the game hardware requirement.
Regarding your question on changing CPU, it is possible, it is best to check with Toshiba whether they have a compatible list of CPUs that have been tested on the board.
Otherwise, you will need to do trial and error, provided the cpu has nearly same features as the one on the board now. (use same socket type cpu)
All the best,