Originally posted by: saxophonoia
So on this, you don't have a fan on your heatsink and instead just use the exhaust fan to blow in instead?
I have both. I have my hard plastic duct coming from the back of my case (think about VHS tape size and shape, but rounded airflow paths on the inside). The area where this plastic duct is over my CPU, it has a square area to mount a 80mm fan in that kinda sticks out from the VHS-shaped duct. So the size/shape of a VHS tape is the airflow (it's NOT as wide as the 80mm fan). So this 80mm fan attached to the duct is basically pulling outside air and blowing right at the top of the CPU fan (and some of it goes elsewhere in the case too, it's not enclosed around the HSF). Then my TT Smart Fan 2 does a good job on my SLK800. I never see over 40C on my CPU, even OC'd quite a bit under load. But, of course, we keep our apartment pretty cool - under 70F.
Sorry if I'm not explaining it very well. I'll disassemble my duct tonight so you can see what I'm talking about. The duct came specifically for my case. It isn't the prettiest thing but it's very useful for the temps.
Here's the best I can do at drawing it (beware: this may confuse you even more!):
###__#################################################
##//###################################################
#//####################################################
//#####################################################
######################################################
######################################################
%%%%%%%%%%%
%%%%%%%%%%%
%%%%%%%%%%%
*************************
*************************
*************************
||||||||||||||||||||||||||||||||||||||||||
||||||||||||||||||||||||||||||||||||||||||
||||||||||||||||||||||||||||||||||||||||||
||||||||||||||||||||||||||||||||||||||||||
--------------------------------
The #'s are the duct (I tried to show how it's curved in there too). Right is out the back of the case. Left is going towards the front of the case. %'s are the 80mm fan attached to the duct blowing down. The *'s are my CPU fan. The |'s are my heat sink.
I promise, my pics tonight will be better than this one!