View Full Version : ducting!!! air into or from HSF?? what's better?
Just want to get some feed back about ducting... I have a ducting system that i made with some auto preheater hose and two 60mm fans, 1 at each end. Both fans are bringing air into the hs from outside case air. I've dropped cpu temps from 46c to 43c!! What I want to know is can you get better results when you have the fans bring air into the hs OR pulling the heat out from the hs??
If you try to suck air around the HSF hoping to cool it then it will work provided the air around the HSF is COLD. I think the best way to do it would be to duct cold air onto the HSF then duct the hot air out of the case.
ducting is something i know only from reading stuff (no experience) but i beleive the way it is might be the most efficient. to suck air out the hs requires the heatsink to have a design that can work this way:
http://forums.overclockers.ws/vb/showthread.php?s=&threadid=36794&highlight=fop38
http://www.amdmb.com/article-display.php?ArticleID=105&PageID=7 at the topic "fan flow and direction"
The answer depends on the specifics of your system, what heatsink you have, your airflow through the case, ambient conditions etc. The best thing is to try it both ways and see what happens. I've got mine exhausting.
nihili
Originally posted by nihili
The answer depends on the specifics of your system, what heatsink you have, your airflow through the case, ambient conditions etc. The best thing is to try it both ways and see what happens. I've got mine exhausting.
nihili
i have the volcano 6Cu+ which has a copper base. as far as case air flow; i have one 80mm fan sucking hot air out of the case as well as the psu fan. my room is always cool in the winter so i'm safe as of now. do you think my hsf works better sucking air into or out of??
JayP, there's no way for me to know. I'd need to see exactly how the air flows through your case, what the temperatures at various spots in your case are, what your room temperature is, what other heat sources you have, how close those are to the heat sink, etc etc et. There are just too many variables to make a confident guess. And even if we could get all the variables under control, it would be at best an educated guess.
Fortunately there is a very easy way to get an absolutely authoritative answer to your question. Track your temps for a time with your current setup. Then turn the fans around and see if it's better.
I'm not trying to avoid your question, this really is the only way to be sure.
nihili
hello jay..
i have tried this and have experimented to the max.. the best result i had was to have two fans blowing.. i had an 80mm fan blowing on a tiasel760 and then had a duct straight to the side of the case with another 80 mm fan blowing in, and this dropped my temps by 7 - 8 `c with them blowing out it actually only dropped by 3-4`c with them blowing i had a problem that the case fan sometimes interfered with the cpu fan, so i had the cpu fan on 12 volts and the case fan on 7 volts and kept the same temps..
some people may argue that because your dumping more air t around the cpu, you not actually cooling the cpu. because you have more cold air flowing around and under the cpu that you are actually cooling the temp diode under the cpu giving you a false reading, well i actually used plastic tubing that was the exact same size as an 80mm fan and when the case side was fitted the distance was about 5mm so i dont think they were right.. so as i say to my misses .. blow ... dont suck..
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