P180 questions

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Just got my P180 through the post, set it all up and everything is running fine - just got a couple of questions regarding the cooling.

The case comes with 2 exhaust fans as standard - the rear and top - but I was just wondering if the system would be better cooled by turning the top fan into an intake? I'm running the AC Freezer64 Pro and with it being such a large heatsink, and so close to the top fan anyway, it just seems natural to have it blowing down on top - has anyone experimented with this?

The second thing is the VGA duct - I had this installed and setup with a Zalman slim 80mm fan connected to a fanmate at its lowest setting. This turned out to be the noiseist part of the case, not so much the fan but the sound of the air travelling through the duct, so I've now removed the whole duct from the case.
What I noticed was my temps with the duct and fan in place were 45c for the CPU on full load and 42c for the graphics card (pretty much idle). Now, with the duct removed I'm sitting at 42-43c CPU and 40c for the VGA card. Have other users experienced lower temps with the duct removed? I had the fan setup as a rear intake as advised in the manual - I actually thought that this didn't make much sense as the vent sits between the PSU and case exhaust fans so surely the VGA fan would be taking in warmer air - would it have a better effect setting the VGA fan/duct up as an exhaust?

Finally, I've got the choice of putting in a Zalman CNPS7700-ALCU or sticking with the AC Freezer 64 Pro - anyone got any idea which would be the better one to go for?
 
Thanks for the great reply! I'll experiment with the top exhaust fan tomorrow at some point.
I know what you mean about the cramped conditions - I don't really see why the VGA duct has to be so large, and why it has to be made of cheap plastic causing extra noise.

As for the Zalman, I actually currently have both and only installed the AC today when I moved over to the P180. My CPU (A64 4000+ @ 2.7GHz) has had the IHS removed and I noticed when removing the mobo that the Zalman wasn't totally steady just sitting on the core, so I removed it and shoved the AC on instead. Now I'm not sure if it is worth my while modding the Zalman mounts in order to get a better seating or just stick with the AC - guess I'll just have to experiment over the coming days. :)
 
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