Depends entirely on the game specifically and the settings used. BF1 can bog down any i5, as can Ashes of the Singularity, WoW, modded Gta:V, there's plenty more. It's only because these games are optimized for more than 5 threads, so any quad will suffer. MGS:V on my i5-3570k saw 90% usage or better, swapped it for an i7-3770K and usage dropped to 55%. This can affect streamed games used through Arc or Steam, depends on the actual usage. For heavy single thread games like cs:go, LoL, Wot etc, it'll be GHz that's going to be more important than thread count, with graphics only limited by the gpu. 3.0GHz is about the cutoff, over that and the cpu will handle anything reasonably, under that and the cpu will struggle to some degree