My game is broken after PC upgrades :/

[RyRy]

Basically, i upgraded my PC from 4th Gen to 6th Gen cause my processor had burnt out due to some intense overclocking lmao. So since its been broken i haven't been able to play anything without it overheating and dying (means nothing now tho). So before i would play on a i7 4960x and my FPS would be fine. Now i try play on a i7 6800k and the FPS counter says its on 59-60 fps but plays like its on 20. it does this no matter what graphics settings i play on and with weather on or off. I've tried everything to fix it but i cant get it to go back to normal. However, uncapped i get between 200 - 400 fps. The problem with this tho is that the sensitivity changes too much as i believe its tied to fps (idk if this is right but this is what i have seen from playing it). Having the sense randomly increase and decrease makes it kinda unplayable for me right now.

Specs before:
i7 4960x
GTX 1070 msi Gaming X
16 GB x 1 kingston RAM 1666mhz (idk what type but it was turd)
and some shitty mobo

Now:
i7 6800k
Same GPU
8GB x 2 Vengeance 3200mhz
and some tonk mobo ngl

on both i played on Max settings (Fantastic?) at 1920 x 1080

any help would be appreciated right now cause i'm finding it impossible to fix tbh :/
ty you man/woman

[Mars]

@jcryer

[Reminance]

@jcryer
@Vreg
@Nova
@Kai
@Shivraj
@mattaleks

Any ideas or solutions to this?

[Vreg]

Upgrading your CPU shouldn't turn it into a bottleneck unless you did something wrong with your upgrading procedure where the CPU doesn't work as intended. Driver issues perhaps?

[LethalDarkness4]

Upgrading your CPU shouldn't turn it into a bottleneck unless you did something wrong with your upgrading procedure where the CPU doesn't work as intended. Driver issues perhaps?

dw VREG SLO works fine for him now