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strange question

by carl4286 / December 9, 2004 5:36 AM PST

I have a rather odd question.... would the fan on a video card (specifically the x700 pro) blow air onto the heatsink or blow air away from it. I don't have the card yet so I can't look.

I was wondering, because I was planning to buy a PCI fan to place directly underneath my video card so it would line up with the fan on the video card, and blow the air from the the card, out of the case to help with cooling, so I could overclock the card.

With that said.... the PCI fans (go in a PCI slot, and have a fan on the inside with a vent on the outside), do they blow air into, or out of the case?

My post is a bit hard to follow, so if you don't understand where I am coming from, I can try to explain more clearly.

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Re: strange question
by R. Proffitt Forum moderator / December 9, 2004 5:42 AM PST
In reply to: strange question

A quick look around finds the fan blows onto the heatsink on the video cards I have.

Bob

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Re: strange question
by carl4286 / December 9, 2004 6:09 AM PST
In reply to: Re: strange question

I just looked at my coputer, and it looks like the fan for my CPU blows into the heatsink aswell.... strange.

Well, does this mean that the PCI fan I talked about also sucks air in through the vent, and blows it into the computer? If not, installing the fan would just give my new video card a harder time cooling the GPU's.

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Re: strange question
by westerntony / December 11, 2004 11:33 AM PST
In reply to: Re: strange question

This is an age old question. First ran into it when I started as an Engineer. To sum it up " is it better to blow or suck"? There is no hard and fast rule. However if you are trying to cool a "Hot Spot", Heat sink-CPU chip-Memory,then you want to concentrate the air on the spot or heat source. For overall cooling of the interior of the "box" then you would want to get the fan near an entrance to get the maximun amount of cool air & blow it toward the heat sources. What you do not want is to pull in dirty air (usually the bottom of the box) and blow it onto the electronic components. Hope this helps you think it through & helps you.

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Re: Best bet?
by Scott Swinyard / December 12, 2004 6:27 AM PST
In reply to: strange question

Fans at one end of case blowing cool air in, fans at other end blowing out to remove hot air and device fans blowing directly onto the chips and away into the case.

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Re: strange question
by Glennmc7 / December 13, 2004 11:19 AM PST
In reply to: strange question

Your question is a very good question and my customers ask me this all the time and what I and most techs recommend is that the fan should be placed on the heatsink so that the air is being sucked off the heatsink not blown on. Just think about it do you realy want hot air to get blown on to the heatsink and make it hotter or do you want the hot air to be pulled off so that the cooloing fan can suck the hot air back out of the system cooling the system off.

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