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  #1 (permalink)  
Old 28th March, 2005, 07:32 PM
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suck or blow?

hi ppl,
i have had to put a fan on my graphics card heatsink to try and keep it cooler, after reading through the forums um not sure it is on right.
at the mo i have it blowing onto the heatsink, would i get better cooling if i had it sucking the heat off the heatsink??????
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Old 28th March, 2005, 08:04 PM
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Blow!

Also, ensure that there's good airflow through the case.
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Old 28th March, 2005, 10:12 PM
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Regarding the title of this post...

So many jokes...so little bandwidth.
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Old 18th April, 2005, 03:26 PM
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i must say i have never heard of a pc fan blowing the heat away can it be done ?
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Old 18th April, 2005, 03:32 PM
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Blow! higher peak velocity over the fins so greater forced convection effect.

Sasrob : Think about a cpu heatsink fan arrangement, and then the penny shall drop
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Old 18th April, 2005, 03:40 PM
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8 times out of 10 blowing onto the heatsink is best, but in some situations, sucking is best, the only way to be sure is to test both
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Old 18th April, 2005, 03:43 PM
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Blow. The sort of fans used in computers like to have a lot of air at their inlet. When you push or pull air through an obstruction, its pressure drops. This means that in a "suck" arrangement, you have less air at the fan inlet, move less air, move less heat and see greater temperatures. Search the forums for the math answer. I wrote one about 3 years ago...
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Old 18th April, 2005, 03:56 PM
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really have to have it blowing into the heat seek as this will beat the heat down but if u have it blowing away from the heat seek it's going to get very hot as there is nothing to stop the heat from building up around the cpu all you would be doing is takeing the heat from the sides of the heat seek leaveing the cpu to get hotter!!!!!
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Old 18th April, 2005, 07:25 PM
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Just to be cantankerous, the Alpha 8045 used to perform better when it was sucking the air That's the only one I can think of which was designed to work like that.
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Old 26th April, 2005, 09:03 PM
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test both suck and blow? this isn't a party for randy teenagers you know.

But yeah, it usually is best to blow cool air onto the heatsink. By doing this, you will take cool air onto the heatsink and then it will escape in the space between the fins at the ends. Plus what all 'those lot' above me said.
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Old 27th April, 2005, 12:35 AM
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I've found that if you have a low speed fan, and let the cpu get hot for the purposes of keeping it quiet, that the surrounding components benefit from the fan sucking, rather than blowing very hot air onto them.
For instance my celeron d system, I have the fan setup so that the cpu reaches 60°C at full load, now blowing air onto the heatsink causes the surrounding mosfets and the northbridge to reach close to 70°C, but sucking keeps them around 40°C
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Old 27th April, 2005, 07:57 PM
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hmm, when i was fiddling around with my system a while back, i wondered which would be best. If there is anything you should know it is this; find what's best for your system and what suits your needs. Obviously, unless you have bought a specific heatsink for your graphics card, don't go messing with the fan (if it has one) as you could cause damage permanantly because they have been designed by experts, and they're made to look nice by the design team so you really don't want that almost naked chick on your heatsink looking like maggie thatcher vs terminator do you? But yeah, it is really what suits your system. Some points to take into consideration are the ambient temperature of the room, how much air from outside you can get into the room and anything such as curtains which can insulate heat inside the room.

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Old 19th May, 2005, 11:25 PM
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blow
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Old 20th May, 2005, 12:08 AM
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Quote:
Originally Posted by skool h8r
test both suck and blow?

I agree test both....This can depend on case config fan speed and so on. So try, try again and see which suits your setup....
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Old 28th May, 2005, 10:19 PM
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my look at the question:


..............|...........
\.............v........./
`\...........|....... /
``\.........v....../
```\............./
````\______/
`````|_FAN_| (arrows showing airflow)
`````|....|....|
`````|....v....|
`````|...........|
`````|............|

everyone see where im coming from? the air blown out is much more focussed than the air sucked in... sucking takes the air from a large area, so it is moving at a lower speed, but blowing gives less spread so the air moves faster, giving better cooling!

admittedly yes, the alpha 8045 did work beter sucking... dont ask me why!

(and alright its not very clear.. but it is just me or did it used to recognise whitespace? are the posts read as html now?)
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Old 28th May, 2005, 10:43 PM
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Quote:
Originally Posted by ichorid

admittedly yes, the alpha 8045 did work beter sucking... dont ask me why!
The alphas have a shroud so that only a small space right at the base of the HSF is used as an inlet for air. This causes the coolest air to hit the hotest part of the HSF first. If you were to take the shroud off then it would work better blowing but still not as good as sucking with the shroud on.
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