switching cpu from a intel core i3 4130 to a intel pentium g3258


No. It may not POST, but I'd presume that it will run at the lowest frequency if it's an unknown CPU (it's how most HP systems behave).
 


I built a computer with a pentium g3258 and a gtx 960 and it stutters to much when I play gta 5 and the hp is my old computer
that play light gaming on