Reversing case+CPU fan? good or bad?

J

-=JaySin=-

Weaksauce
Joined
Jun 25, 2004
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i was wondering if it would be a good idea to reverse my case fan(so it bolows air out of the case). In additition to being a case fan the fan also cools the CPU ( some simple duck work link the two). will this hinder the cpu's ability to stay cool?
 
most hsfs have the fan blowing twards the cpu... not away from it...you prob have it upside down
edit: oh i see what you did... hmm thats a interesting situation... sucking from the cpu would reduce case temps and cpu temp in theory
 
This is one of those things that will work on some systems and not on others.... i say, try it!! what have you got to lose? your CPU?? :eek: ... I'm no fluid dynamics expert so yeah lol..
 
:) ok, i reversed my cpu fan so it blows out of my case. my case temperature seemed to drop a few degrees while the air that my PSU is expelling seems slightly hotter. I haven’t tested this new configuration with a extended full out %100 Cpu load buy I played Far Cry (new game that puts a %50 load on a p4 2.6 ht) for about and hour and saw or felt no problems. In addition to reversing the cpu fan I also covered four sides of my cpu heat sink making a duck like structure around the heatsink. Because of the duct the fan sucks up air that is closer to the cpu and not to the top of its heat sink. Another note, with this setup I can now touch and hold my finger on the way bottom of the heatsink on the CPU
 
Actually, OEM's like Dell, Gateway, IBM have been doing this for a while now. They just use a passive heatsink and a plastic shroud over towards the rear 92mm exhaust fan.
I wouldn't overclock with that kind of setup though...
 
yuriy80 said:
Actually, OEM's like Dell, Gateway, IBM have been doing this for a while now. They just use a passive heatsink and a plastic shroud over towards the rear 92mm exhaust fan.
I wouldn't overclock with that kind of setup though...
Click to expand...

so your saying it could be worse than my original "fan blowing on the cpu" configuration?
 
no, it depends on the setup, but he's saying that there's no actual fan on the cpu heatsink of most oem systems such as dell, just a duct from the rear exhaust fan to the heatsink, so there's no real active cooling on the heatsink whereas your heatsink has a fan on it
 
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