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 Post subject: Which way to put fan
PostPosted: Mon Jun 11, 2007 4:57 pm 
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This may sound like a total noob question but, when I get my HR-03 for my 8800 Ultra which way do I put the 92mm fan? Blowing onto the card or out from the card :-)

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 Post subject: Re: Which way to put fan
PostPosted: Mon Jun 11, 2007 8:33 pm 
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falcon26 wrote:
This may sound like a total noob question but, when I get my HR-03 for my 8800 Ultra which way do I put the 92mm fan? Blowing onto the card or out from the card :-)


You'll want the fan blowing the air away from the card so it helps dissipate the heat from the heatsink into the surrounding air.

Nick


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PostPosted: Mon Jun 11, 2007 9:07 pm 
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You'll want the fan blowing into the heatsink. That way the heatsink will stay cooler.


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 Post subject: Re: Which way to put fan
PostPosted: Tue Jun 12, 2007 3:04 am 
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NickSD wrote:
...away from the card...

borc wrote:
...into the heatsink...

Somehow I don't think falcon26 is going to be happy with this! :D

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PostPosted: Tue Jun 12, 2007 3:32 am 
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Into the heatsink, assuming this means blowing upwards. IMHO it should work better for the overall case airflow.


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PostPosted: Tue Jun 12, 2007 4:07 am 
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General rule is: Never go against natural air flow. And hot hair will go up. So make the fan always blow upwards:

Against the HSF if sink is below the card and away from the sink if sink is on top of card.

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PostPosted: Tue Jun 12, 2007 10:03 am 
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Agree with fan blowing up so the air moves towards the exhaust, drawing from intake.

All coolers usually have their fan blow towards(in) the heatsink, as this is more efficient for cooling it, but it may not be absolutely required. Thermalright FAQ agrees with fan blowing from bottom to top.


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PostPosted: Wed Jun 13, 2007 2:37 pm 
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Well it looks like this

http://www.thg.ru/graphic/thermalright_ ... _in_pc.jpg

I have it blowing away from the HSI....but I guess that's wrong right?

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PostPosted: Wed Jun 13, 2007 3:06 pm 
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alot of aftermarket VGA coolers work on the assumption that the fan will be clowing onto the card, so that the memory and power circuits (VRM) get some cooling. This is usually provided by the stock cooler (particularly on high end cards) and lack of VRM cooling is often the cause of screen artifacts. So blowing onto the card :)

Also, although it pays to go with natural convection wherever possible, it's usually such a minor factor in component cooling (MikeC's looked into this I believe) that it won't be a huge deal if you go against it.

Or, you could always just try both ways and see which works best!


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PostPosted: Wed Jun 13, 2007 3:27 pm 
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I used to feel the same way about natural convection (that it was a minor factor in cooling)......that was before I got serious about positive pressure, and totally passive exhaust flow. Take a look at this setup.......

Image

It has absolutely no exhaust fans.....the PSU is fanless. Natural convection and positive pressure vent all the exhaust out through the top edge slots (hard to see) and the fanless Zen. Natural convection is a powerful force in a computer....and ignored too often. Make as much use of it as possible, if you want the quietest possible setup.

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PostPosted: Wed Jun 13, 2007 4:20 pm 
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Ok I mount the fan with it blowning on the heatsink. I've ran it about an hour now. Here are some results:

Stock Fan

Idle: 68C
Load: 85C


HR-03 with 92mm Nexus Fan

Idle: 54C
Load: 74C

Much better and the fan is only at 1200 rpm's but its dead silent now. I ran 3d mark a few times and it was dead quiet, exactly what I was looking for :-) Now I'm just worried about those memory heatsinks. They were falling off before but I think I got them to stay this time.....I hope :-)

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PostPosted: Wed Jun 13, 2007 4:38 pm 
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bluefront - I guess an easy way to test that theory is to, if possible, turn the PC upside down with the same access to vents etc. If there's more than degree or two (ie. more than the margin of measurement error) difference, then I'd agree with you. Be interested to hear the results!


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PostPosted: Thu Jun 14, 2007 12:40 am 
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Too OT for this thread....this design cannot be flipped. The exhaust would be blocked, and sucked back into the intake. Other setups have proven this theory 100%. Start a new thread on the subject if you're interested....

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PostPosted: Thu Jun 14, 2007 8:00 am 
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VRM and mem chip cooling is important too. I've got a case fan for that, so I overlooked the fact.

Your temps may go up during the next month or so as the paste settles and dust starts gathering. Hope you got it right the first time and wish you have a nice everafer with the cooler. :)


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PostPosted: Thu Jun 14, 2007 4:00 pm 
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meh, whatever Bluefront. OT or not, you did bring it up. Other set ups have disproven this theory too - stating otherwise makes it sound like dogma, not fact. I'm not saying natural convection doesn't help, but I can't see it being anything more than a minor factor given the tiny heat differentials. As I've said, MikeC's spent time looking into this and, as empiricism proves or disproves theory, simply trying what I suggested (making sure the exhaust vents have a bit of space - easy with a couple of planks of wood) should give a more robust answer. Given that you have active airflow in that case I can't see how any additive effect of natural convection can be anything but inferred.

That way SPCR, and people like the OP, will benefit, surely?


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PostPosted: Thu Jun 14, 2007 4:47 pm 
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What we all should be doing here at SPCR, is to try to keep our computers as quiet as possible. And that means we need to move heated air out of our cases as quietly as possible. Natural convection is there for the taking.....totally free, and almost silent in computers. If you attempt to force heated air to flow downward, rather than upward, you are wasting energy, and making things more noisy. The problem we face when using natural convection.......the majority of cases are not designed to use natural convection, not to mention heatsinks on cards are below the card in most cases. You have to work at it, to make natural convection work as well as it can.

It's a little more complicated than installing a few ducts......and drilling a few holes.

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PostPosted: Thu Jun 14, 2007 7:10 pm 
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I don't disagree with you in principle but in degree. The questions I'm interested in are not "does natural convection help?" as I'm sure it does, but "how much of an effect does it have, per se and relative to forced convection" and also "is it enough of an effect to worry about going against natural convection".

I've taken your suggestion and put this up as another thread in the Silent Front. Apologies to the OP for taking the thread off topic! :)


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