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 Post subject: HD7770 DirectCu vs DirectCu II, quieter one?
PostPosted: Thu Dec 20, 2012 8:47 am 
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This may sound a bit stupid, but I would like to know which of these two versions would be more silent:

http://www.youtube.com/watch?v=E33lS75qeLY
http://www.youtube.com/watch?v=uMoJLfWdDk8

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I've found very little research on the DirectCu II version as its more expensive and most people would rather get a 7850, specially those who are not in the silent world ;) Another "advantage" is that this one has 2GB of VRAM, pretty pointless for a mid-range GPU anyway.


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 Post subject: Re: HD7770 DirectCu vs DirectCu II, quieter one?
PostPosted: Thu Dec 20, 2012 9:39 am 
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Haven't seen any reviews for the 2-fan version. Here's the single fanned one reviewed at Techpowerup. It's down near their noise floor.

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 Post subject: Re: HD7770 DirectCu vs DirectCu II, quieter one?
PostPosted: Fri Dec 21, 2012 11:49 pm 
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The difference would be pretty negligible but two fans are louder than one.

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 Post subject: Re: HD7770 DirectCu vs DirectCu II, quieter one?
PostPosted: Sat Dec 22, 2012 9:11 am 
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claes wrote:


You can't make this conclusion without knowing the details of the two coolers. The fan profiles may be different, the heatsinks may be different, etc..

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 Post subject: Re: HD7770 DirectCu vs DirectCu II, quieter one?
PostPosted: Sat Dec 22, 2012 10:48 am 
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claes wrote:

At the same airflow.

The DCU-II has a larger heatsink and more fan "area", because of this it very likely that it will need less airflow and thus be quieter.


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 Post subject: Re: HD7770 DirectCu vs DirectCu II, quieter one?
PostPosted: Sat Dec 22, 2012 11:38 am 
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tim851 wrote:
claes wrote:

At the same airflow.

The DCU-II has a larger heatsink and more fan "area", because of this it very likely that it will need less airflow and thus be quieter.


Interesting info :)

I'm looking for a review, sadly it is not a very popular card.


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 Post subject: Re: HD7770 DirectCu vs DirectCu II, quieter one?
PostPosted: Sun Dec 23, 2012 10:32 pm 
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Steve and Tim are right, I was merely arguing that the two fans spinning at the same speed as a single fan would be slightly louder. That does not account for the resistance they face.

Found this though. There is also a DirectCuII v1 that is different, but that doesn't seem to be the case with the 7770.

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 Post subject: Re: HD7770 DirectCu vs DirectCu II, quieter one?
PostPosted: Mon Dec 24, 2012 1:44 am 
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tim851 wrote:
claes wrote:

At the same airflow.

The DCU-II has a larger heatsink and more fan "area", because of this it very likely that it will need less airflow and thus be quieter.

Actually, for the same airflow, two fans can easily be quieter than one, since they will be running slower. I think you meant at the same speed (ie, with twice the airflow) rather than the same airflow.


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