Hi,
i ve been building pcs for many years. The most important thing for me is noise !
My way is the following:
overclock your cpu for about max 20-30 percent
my cpu is 8700k oc to 4700 all cores
then undervolt the cpu so long as you got a stable prime95
i use the noctua nd-d15 for many years (before nh 14d)
use the y-cable to get 7v or use your own cooler control
fan should be max 900 rotation
my pc is almost quiet - 32db - independent on load
temps are max 65 on load