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Thread: rad fans what to do?

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    Default rad fans what to do?

    Still not sure what to do here. A few dumb questions. Sorry if this has been asked but I could not find it.
    My rig has intake fans at the front of case and exhaust at the back.

    I'm going to top mount the 360 rad.

    Question is which do I do.
    1 have the air go from inside the case to out
    2 have the air from outside of the case to in

    And does it matter if the fans are above or below the rad?

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    Default Re: rad fans what to do?

    # 2 have the air from outside of the case to in.

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    Default Re: rad fans what to do?

    Quote Originally Posted by killjoyjim View Post
    # 2 have the air from outside of the case to in.
    Thank's for that.

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    Default Re: rad fans what to do?

    Go with option 1 unless you want to continuously pump super heated air onto your motherboard, GPU, and other components.
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  5. #5
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    Default Re: rad fans what to do?

    Quote Originally Posted by SamCR3 View Post
    Go with option 1 unless you want to continuously pump super heated air onto your motherboard, GPU, and other components.
    Oh okay didn't think of that.

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    Default Re: rad fans what to do?

    The more efficient way from a cooling point of view is to use cool air from outside of the case to cool the rad/water. This will result in the lowest possible cpu temps at the expense of raising the air temp inside the case..... by a few degrees at most provided there is already decent airflow through your case.

    Adding air flow into the case is unlikely to overheat anything.... remember that for most folks there are not just the extract fans to remove it, there are the psu and the graphics fans too. If you are concerned that there may be dead zones that are not getting cooled enough or that the other areas of the computer such as MB RAM or Graphics Cards that should have priority over the cpu for best cooling you can either reverse the radiator fan air flow or add a destratification fan.

    Generally speaking, fans work better when they push air through the radiator.
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  7. #7
    Lim
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    Default Re: rad fans what to do?

    My experience has shown to blow the radiator out, and the others to act as intakes. On a top mounted 240 radiator with a 150W CPU under full load I had these results:
    radiator blowing in: case 32C CPU 43C
    radiator blowing out: case 22C CPU 44C
    So unless you are getting near the "hit the wall" temp for your processor I think the lower case temps justify radiator out, even if you have no conventional hard drives (which suffer when baked over time.)
    360 rad indicates you are using full sized case, but on smaller cases it is even more critical to pipe the heat outside of the box.

  8. #8
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    Default Re: rad fans what to do?

    I have the CFI A7007 Taiji Full Tower Case
    It has room for 2 intake or exhaust fans at the bottom.It has in it two intake fans at the front, 1 exhaust fan at the rear hard drives are in separate compartment and SSD is at the back side of the case behind the hard drive bays. you can see a review here to show you what I mean https://www.youtube.com/watch?v=WSRxzhBGYxM

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    Default Re: rad fans what to do?

    You can always use case scheme to put your rads and fans (blow out or in).
    Put your rads and fans as intake (blue arrows), and as outside where red arrows are.

    Always look beyond the limits...

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    Default Re: rad fans what to do?

    Quote Originally Posted by Lim View Post
    My experience has shown to blow the radiator out, and the others to act as intakes. On a top mounted 240 radiator with a 150W CPU under full load I had these results:
    radiator blowing in: case 32C CPU 43C
    radiator blowing out: case 22C CPU 44C
    So unless you are getting near the "hit the wall" temp for your processor I think the lower case temps justify radiator out, even if you have no conventional hard drives (which suffer when baked over time.)
    360 rad indicates you are using full sized case, but on smaller cases it is even more critical to pipe the heat outside of the box.
    This is a pretty average example of what happens. You gain 1-2 degrees on your CPU and create a nice convection oven for your GPU, VRM and RAM to operate in. Especially with a 360 and the sheer amount of heated air you will be blowing into the case.

    In 90% of builds, using rad fans as intakes is incredibly myopic.

  11. #11
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    Default Re: rad fans what to do?

    It really depends on the case and its size, as well as the ventilation it provides
    some cases require positive air pressure and some don't, you can try both ways to see what gives you the best results.

    Is this the inside of your case?
    rad fans what to do?-81y-uwbxdpl._sl1500_.jpg

    I always found this interesting as well.
    I currently have two 120mm up front pushing in on a 240 rad three 120mm up top pushing in on a 360mm rad
    and one 140mm exhaust in the rear blowing out and this seems to work the best for me.

    Last edited by vinman; 27-12-2014 at 16:59.

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  13. #12
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    Default Re: rad fans what to do?

    I think the only reason you should pull cool air in thru the rad is if thats the ONLY way your system will work.. Like the pandora case, it would be hard to top mount a rad. (fyi - - if you top mount, always push air out - heat rises)

  14. #13
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    Default Re: rad fans what to do?

    Quote Originally Posted by vinman View Post

    Is this the inside of your case?
    Click image for larger version. 

Name:	81Y-UwBxdpL._SL1500_.jpg 
Views:	210 
Size:	211.2 KB 
ID:	7103
    No I sold my NZXT H2.
    Here are some pictures.

    inside of both areas front for hotswap bays and the main area.
    Area at the top for the rad.

    This is the inside the kind of wall between the hotswap bays and the main inside section. The two 120mm fans blow through the hard drives and out of here in to the rest of the case. You can feel a lot of cool air coming through.

    Back behind the hotswap bays on the other side of the case is where the SSD is


    Hotswap area
    Last edited by mixsetup; 27-12-2014 at 23:37.

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    Default Re: rad fans what to do?

    Going to replace the GPU this week with MSI 280x
    MSI Global R9 280X GAMING 3G

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