Depends on the game entirely. Bf4 multi-player will max out a G3258 easily, no matter what OC it's at, whereas with a decent i5 or better, you'll be pushed to max out a gtx970. On average, an i3 will choke the performance of a 970, its an off balance mix of weaker cpu vrs stronger gpu. A good balance would be a r9 270x or gtx 660ti with an i3, especially at 1080p/60Hz.