CPU rear fan size?

[gerry410]

Hi all, I have a cooler master cm 690 ll case (Not Advance).
I want to add a fan behind the CPU on mother board.
What size fan could I get for the small vent behind the CPU.
Would I have that fan pulling air in or pushing it out?

Thanks all

 

[davcon]

80mm in that mount.
You'd have to experiment what yeilds best temps.
I'd probably use it as an intake if you have any vrms on the back of your mobo.
I have that case and have never felt any need to add a fan there.
Best additions to that case for cooling are 2x140mm top exhaust and a 120mm on back of hdd cage for gpu cooling.

 

[sosofm]

I have that case i think that is 80mm fan. I never add a fan there.

 

[gerry410]

Best answer selected by gerry410.