Question Time for an cpu upgrade?

kekohofficial

Prominent
Dec 7, 2017
11
0
510
Heres my build:
i7 6700(Non-K) 3.4GHz
Asus H170 Gaming Mobo
MSI GTX 1080TI
16GB of Ram
1TB SSD
1TB HDD

Explanation:
my CPU is the oldest thing I have in this build and when I play games I feel it is limiting my GPU a lot, I run wallpaper engine and sometimes it can go up to 100% in usage, I feel like its really bottlenecking my GPU and limiting its performance as sometimes I lag playing games like GTA... And if I need an upgrade what should I get upgraded for cpu. Any suggestions