i am impressed
i bought a new case today - the only change from my old case is that it has a fan cut out right at the CPU level - with a duct about 4 inches long, that can extend to touch the CPU fan.(it is adjustable)
on normal (not overclocked) the cpu - a p4 2.4a on %100 load after running seti for a day or so would hit anywhere from 43-48C - ambient temps around 30-34C
with this duct - to which i added an 80mm fan between the duct and the case (only 2800RPM) as opposed to just the duct going down to the CPU from the side panel - which has a thermaltake Sparl A1545 (http://www.thermaltake.com/coolers/spark/a1545.htm) they say a MAX of 6000 RPM - but mine goes upto 6800 RPM!!!! - the temp now after running seti almost all day and night, over 13 hours is sitting @ a cool 36C. with the Spark sitting around 5900RPM as it always does.
My ambient temp which would sit around 31-31 is now at 32c solid it seems- Today was a very ho and sticky day as well - so i thought it would get hotter, but it didnt'!
I am really suprised at how much this "duct" has cooled my case.
i have 2 80mm in the front of the case and 2 x 80mm in the back - same as i had before on my other case. for a total of 5 80mm fans - all run around 2800 RPM on average.
Some pics



So yeah, go out and get some ducts!
this system is currently running cooler then my water cooling rig was! - but it was not realyl set up right

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