Case fan setup for fractal design R4

[P8P67]

Hi!
I have a Fractal Design R4 case and i have two fans in it, but i want better airflow and cooling. How should i configure my fans. I can buy more fans. Right now i have one in the front and one in the top in the back. Will a side fan help?

Spec:
Asus Z97-A
i7-4970k
Gforce gtx 970
Corsair Vengeance 1600MHz 4GB x2
Corsair Rm850
Kingston SSD 120 GB
WD 1TB HDD
Win 7 Professional

 

[Outlander_04]

In at the front and bottom , out at the back and top

The only time I'd consider a side fan [ which tends to disrupt air flow ] is if I had a massively hot SLI system and needed to feed it cold air

 

[P8P67]

In at the front and bottom , out at the back and top

The only time I'd consider a side fan [ which tends to disrupt air flow ] is if I had a massively hot SLI system and needed to feed it cold air

Ok. Just another question, I have a fan lying around and I tried putting it in the bottom fan intake. But in the bottom fan intake there is alot of hexagon holes, and the fan makes a wierd noise when u put it against them. Do you know anything u can do?

Picture of the holes:
https://www.google.se/search?q=fractal+design+r4&espv=2&biw=1920&bih=955&source=lnms&tbm=isch&sa=X&ved=0CAYQ_AUoAWoVChMIhNK2_uC3yAIVypQsCh199ASV#tbm=isch&q=fractal+design+r4+bottom+intake&imgrc=2yoTJJJFwguZQM%3A

 

[Outlander_04]

If the noise is caused by vibration then add foam pads between case and fan