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Thread: CM690 Case Air flow question

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    Default CM690 Case Air flow question

    I am building a CM690 Mid tower case.Here are my fans layout:2x120mm front intake fans,1x120mm side intake fan,1x120mm rear exhaust fan,2x120mm top exhaust fan,1x120mm bottom intake fanbottom mount,psu fan facing down.
    Is it advisable to convert the 1 top exhaust fan in front to intake?
    This PC is based on Intel Core i7 930@4GHz & Dual Nvidia GTX285 2GB,thanks in advance
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    Quote Originally Posted by Biff73 View Post
    I am building a CM690 Mid tower case.Here are my fans layout:2x120mm front intake fans,1x120mm side intake fan,1x120mm rear exhaust fan,2x120mm top exhaust fan,1x120mm bottom intake fanbottom mount,psu fan facing down.
    Is it advisable to convert the 1 top exhaust fan in front to intake?
    This PC is based on Intel Core i7 930@4GHz & Dual Nvidia GTX285 2GB,thanks in advance
    The fan I am using is Coolermaster Sickle Flow 2000rpm/90cfm led fansOopssorry for double post
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  3. #3
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    Default

    IMO they should be all intake fans with the exception of the rear exhaust.

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    Quote Originally Posted by smduff View Post
    IMO they should be all intake fans with the exception of the rear exhaust.
    Obviously, the considerations in looking at fans are - how hot do the parts get (CPU, GPU, Northbridge, VRM, RAM. HDDs, PSU), how much noise escapes to reach the user's ear.

    I have a CM690 II Advanced case that I run rather balanced:
    intakes: 140mm fan front, bottom 120mm
    out-takes: 120mm top (rear of case), 120mm back
    PSU fan side down, so it doesn't interact with the case at all.

    I have read reports showing that both negative air pressure (which is what you are recommending) as well as positive pressure (more out-take than in-take) produce good cooling results with better noise levels (somewhat) on negative pressure. However, negative pressure system tend to accumulate more dust (on the fans themselves, or the dust filters if the case is equipped with them) due to the increased volume of air entering the system. Since I have never tried negative pressure, please elaborate on your recommendation, Smduff, so I can understand under what conditions you run it and your results. Thank you!

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    Quote Originally Posted by smduff View Post
    IMO they should be all intake fans with the exception of the rear exhaust.
    Is it ok to change all fans to intake except exhaust?Coolermaster seems to suggest otherwiseCPU:42/56 SB47 NB47 MB35









    Last edited by Biff73; 08-08-2010 at 16:02.
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    I'm recommending a positive airflow first off which is better for all the components over all and in my experience just gives better overall temps throughout the chassis. Here is a video that explains it more

    http://www.youtube.com/watch?v=6UWob9KyaB4

    The 690 II is a great chassis one of my favorites to be honest and if you look at the possible water cooling setups, you always want cold air to go through the rads. You can have a rad at the top and bottom of this chassis so cold air should be moving into it.

  7. The following user thanks smduff For this above post:

    eido.cohen (08-08-2010)

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    Quote Originally Posted by smduff View Post
    I'm recommending a positive airflow first off which is better for all the components over all and in my experience just gives better overall temps throughout the chassis. Here is a video that explains it more

    http://www.youtube.com/watch?v=6UWob9KyaB4

    The 690 II is a great chassis one of my favorites to be honest and if you look at the possible water cooling setups, you always want cold air to go through the rads. You can have a rad at the top and bottom of this chassis so cold air should be moving into it.
    I see that I got the meanings of positive and negative air pressure exactly reversed. Thank you for the video!

    Of course, the considerations for a water cooling setup are not the same as those for an air cooling setup, so the idea that both you and 3DGameMan espouse (that positive air pressure is always better), should be taken "with a grain of salt".

    When you say you get better overall temps with positive pressure, this experience is in a) what case with b) what cooling setup (air or water, and how many/what type+size of fans)?
    Last edited by eido.cohen; 08-08-2010 at 16:16.

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    Quote Originally Posted by smduff View Post
    I'm recommending a positive airflow first off which is better for all the components over all and in my experience just gives better overall temps throughout the chassis. Here is a video that explains it more

    http://www.youtube.com/watch?v=6UWob9KyaB4

    The 690 II is a great chassis one of my favorites to be honest and if you look at the possible water cooling setups, you always want cold air to go through the rads. You can have a rad at the top and bottom of this chassis so cold air should be moving into it.
    This video says its not advisable to have all intake fans except rear exhaust

    http://www.youtube.com/watch?v=xt71L...eature=channel
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    Quote Originally Posted by Biff73 View Post
    This video says its not advisable to have all intake fans except rear exhaust

    http://www.youtube.com/watch?v=xt71L...eature=channel
    What he is saying there is not to have all the fans as an intake or exhaust.

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    Quote Originally Posted by Biff73 View Post
    This video says its not advisable to have all intake fans except rear exhaust

    http://www.youtube.com/watch?v=xt71L...eature=channel
    Wait, it gets better. In the 2009 video (linked to by Smduff), GameMan says in his own comments to the video:

    "Isn't negative pressure better for case cooling? Or is it case specific? I'd like to hear your opinion. I would think an equilibrium would be best. Do a demonstration on how to test what is best. Thanx Gameman"

    He seems to hedge his bets by completely vacillating all over the place. This guy, Robbie Reynolds, has some good reviews, but I need something more scientific and rigorous before I can accept any theory.

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    Testing case temps is simple, set the fans up as you think you want them run a system stress test like prime95 and furmark at the same time and record all your temps, then change the fans to a different configuration and rerun the same tests and compare the results.

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    Quote Originally Posted by smduff View Post
    What he is saying there is not to have all the fans as an intake or exhaust.
    Actually, to quote him directly from the 2008 video:

    "Generally speaking the side and front fans should intake cool air and the back and top fans should exhaust warm air." Another contradiction in terms.. he seems to be advocating a a balanced setup both here and in his 2009 video's comments.

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    Quote Originally Posted by eido.cohen View Post
    Wait, it gets better. In the 2009 video (linked to by Smduff), GameMan says in his own comments to the video:

    "Isn't negative pressure better for case cooling? Or is it case specific? I'd like to hear your opinion. I would think an equilibrium would be best. Do a demonstration on how to test what is best. Thanx Gameman"

    He seems to hedge his bets by completely vacillating all over the place. This guy, Robbie Reynolds, has some good reviews, but I need something more scientific and rigorous before I can accept any theory.
    I think what I suggested,2 front intakes,1 top front intake,1 top rear exhaust,1 rear exhaust,1 side intake & 1 bottom intake seems to make senseFirst,U get a balanced number of 4 intake & 3 exhaust fans,also the top front intake fan directly feeds cool air to the cpu cooler,don;t think it can be any better,at least that's what I think
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    Quote Originally Posted by smduff View Post
    Testing case temps is simple, set the fans up as you think you want them run a system stress test like prime95 and furmark at the same time and record all your temps, then change the fans to a different configuration and rerun the same tests and compare the results.
    Well, to be more specific, you need to start the system from a cold boot state (system has had several hours to cool to room temp.) in between tests, and the room temp. (and if possible, humidity) needs to be identical or nearly identical, plus the stress testing needs to run for a significant length of time (an hour or more) if you want accurate results. I'm not saying that there is not a significant difference between various setups. just that in order to be clear that you are getting real results the test conditions need to be controlled except for the variables you are testing (which fans blow in what direction, in this case).

    I am still interested to hear about your specific setup - what case, what fans, and how they are setup, and what temp differences you found when you were testing.
    Last edited by eido.cohen; 08-08-2010 at 16:42.

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    Quote Originally Posted by Biff73 View Post
    I think what I suggested,2 front intakes,1 top front intake,1 top rear exhaust,1 rear exhaust,1 side intake & 1 bottom intake seems to make senseFirst,U get a balanced number of 4 intake & 3 exhaust fans,also the top front intake fan directly feeds cool air to the cpu cooler,don;t think it can be any better,at least that's what I think
    Biff, you are suggesting a positive pressure not a balanced (even if 4 to 3 was balanced) - let's do the math:

    intakes = 2 front + 1 top front (actually top-mid in this case) + 1 side intake + 1 bottom intake = 5
    1 top rear exhaust + 1 rear exhaust = 2

    This means you have more intakes than exhaust and so it is positive pressure (if I now understand the terms correctly).

    Your original post stated two top exhausts, not one exhaust and one intake (as you stated now) which would indeed be a 4+3 setup. But that's still not "balanced". Balanced would mean that the CFM of air coming in matches the CFM of air going out. Come to think of it, unless you know the CFM of each fan and whether or not it has a steady output or changes (due to software or fan controller), you can't really say any setup is effectively "balanced".
    Last edited by eido.cohen; 08-08-2010 at 16:41.

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