Hi guys i,m building my first pc in a while and i'm not up to date with intel. i wanted to buy a 6400 and an asus z170 a but the 7400 is just 10 more,a price that i can justify but the z270 a is 50 bucks mir which i can't justufy so i wanted to buy a 7400 and an asus z170 a but a friwnd told me it woud bottleneck my cpu is it true or is my decision ok?