The i5 2500k is really good, it could really handle previous games at FHD, ultra with no choke.
The Witcher 3, BF4, GTA 5, Arma III etc. stable 75 FPS + (except for arma - it really depends on missions)
It is easy to OC even 4.8 GHz wasn't the problem at all
But to be honest, it has problems to...