Volcano 7+ Fan ..... Blowing On CPU or Sucking From CPU???

[Tincup]

Just wondering why the Volcano 7+ has the fan blowing air onto the CPU rather than the fan sucking (warm/hot) air from the CPU.

My old heatsink/fan (Hedgehog) was setup to suck the (warm/hot) air from the CPU. I noticed a considerable difference in CPU temp when it sucked air from the CPU rather than blowing air onto the CPU.

Can anyone explain??? Or, could it be set up to suck air from the CPU???

:x

[gibsinep]

I think it should be sucking the hot air away. Think about it this way. If you are blowing down at the CPU all the CPU heat is just be pushed back down onto the CPU. But when sucking it you are drawing the hot air away from the processor.


:t

[grimfandango]

naa I think it blowing air on to the heatsink which cools the heat sink too..

:)

[gibsinep]

No Grim I dont think so mabey though. It may also bring cool air into it, however that air would just push the hot air down. Where would the hot air go?

[grimfandango]

cause most of ther fans blow into the heat sink ..and cool the heatsink
that is blow cold air onto the heatsink!
the heatsink is got gaps in between them right so the hot air must go via that!!
I dont know for sure!!


Do you know for sure gib.?
Most of the HS/fans blow air into the heastsink!



:confused:

[Jimstep]

The heatsink/fan combo should maximize the distribution of cooler air against the heated cpu. Blowing cool air on a hot surface will disipate the heat. Plus, the cool air will always be passing through the fan. I don't think hot air being sucked through the fan is a good thing.

[Bizkitkid2001]

gib go stand behind a floor fan(The ones that blow are around a room) and then stand in front of it, in which positition do you feel cooler, in front or in back?

[jad1097]

I think you may find this thread (http://www.sysopt.com/forum/showthread.php?s=&threadid=40871&highlight=Blowing+Sucking) may help. This one (http://sysopt.earthweb.com/forum/Forum3/HTML/007387.html) too.


IMO you should try it both ways and see what works best for your HS. Mine is blowing into the heatsink because it works best for me. You should get soemthing like RC5 (http://www.distributed.net) to run the CPU at 100% to see which way is the coolest at full load.

[grimfandango]

Originally posted by Bizkitkid2001
gib go stand behind a floor fan(The ones that blow are around a room) and then stand in front of it, in which positition do you feel cooler, in front or in back?

Verty true!!!!!
:)

sory gib! !
:eek: :( :)

[gibsinep]

I guess so. I just reached in my case and it was blowing down. I should have done that in the first place. Were was my head on that one yesterday? I knew that too. doh

[Grentarc]

Down is best... if you need to know which was a fan blows, look on the side of it.. it will have an arrow pointing direction of rotatiopn, and driection of airflow.... i think 27°C on a XP1900+ at idle is proof that it works well blowing ONTO the heatsink

[RoboTech]

The fan should blow onto the CPU to push air, cooled by velocity pushing the heat away from the finned heatsink surface area. A great tip, especially when overclocking CPU is to make a hole in side of case directly in line with the CPU and fix in a min. 80mm case fan to really turbo charge your heatsink/fan cooling setup, try it and see that temp. drop :)

[nono_subs]

I think in most instances (ATX cases) where you got plenty of space above the fan and air supply is plenty, then air blowing into the heatsink is better.

However, if you compare it to 1U or slim pc situations, where only a couple of mm distance separates the fan from the top case, you need air being blown out of the heatsink instead.
THe tight space above cannot supply adequate airflow if fan is positioned for blowing into the heatsink.

Just my 2 cents.