Cpu cooler with one fan vs two fans will it make a diffrence

[Reise Martin]

Im running the be quiet 150w tdp cpu cooler with a single fan configuration atm considering purchasing an additional fan. What temp diffrence can I reasonably expect by adding in another fan.

 

[Gam3r01]

Generally the second fan really dosent improve temps all that much, I personally would not recommend spending the money.

 

[USAFRet]

Im running the be quiet 150w tdp cpu cooler with a single fan configuration atm considering purchasing an additional fan. What temp diffrence can I reasonably expect by adding in another fan.

Probably not much at all.
It was designed for one fan. Adding a second might even make it slightly worse.

More is not always better.