highest-CFM 80mm exhaust fan?

[Guest]

Where can I get the highest output exhaust fan to fit a standard 80mm (3" screw spacing) mounting spot?

 

[Guest]

Well, I couldn't find anything much over 45CFM which would fit my existing 80mm mount, so I went ahead and got out the drill and jig saw, and an hour later I have a third fan in the top of my case. CPU temp (running two SETI's 100%) decreased nicely.

Previous
CPU1=49/50
CPU2=44/45

Additional Fan in Top
CPU1=45/46
CPU2=39/41

I wasn't sure if it would make a huge difference, as the case was already "cold to the touch" beneatht the power supply at the midpoint, but it looks like the additional air flow has made a difference.

--and it was free