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Is it better to suck or blow?

Discussion in 'Overclocking & Cooling' started by keakar, Sep 27, 2007.

  1. keakar

    keakar

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    is it better for cpu coolers to have the fan blowing air into the fins and onto the board or suck air out of the fins and draw heat from the board through it? which way is best and why do you think so?

    here is a picture of how it is usually set up:
     

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  2. panchoman

    panchoman Sold my stars!

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    blowing in, no exceptions lol. you should have cold air blowing through the fins so that the air can pick up the heat as it goes through.
     
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  3. kwchang007

    kwchang007 New Member

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    Blowing in....it's like this. Take a fan up to a cold air source...then face it towards you so it's blowing on you. Then flip it around, you should feel a difference, the first time should have more air flowing. This is because the air is focused.
     
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  4. keakar

    keakar

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    well what about a verticle set up like this one? does it matter then? better to push or pull?
     

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  5. panchoman

    panchoman Sold my stars!

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    yes it does, the fan should be sucking from the air towards the intake fans, which should be in the right side of the case. and the hot air should be moving to the left side of the cooler and old through the exhuast fans.
     
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  6. keakar

    keakar

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    so you mean it should still always be blowing into the fins but directed out towards the back of case or upwards towards the psu depending on how its mounted?
     
  7. panchoman

    panchoman Sold my stars!

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    yes, but usually its suppossed to be sucking from the front and out to the back, not sucking from the grafix card and heating up your psu
     
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  8. keakar

    keakar

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    well with the first cooler i find a hard time believing the air in the case is that much cooler than the air that would be drawn up into the cooler from under the fins and pulling in air from around the board.

    blowing air into the cooler, you are blowing hot air directly onto the heatpipes and the board heating them up and the air is then bounced off and upward. unless an air duct is used wouldnt this preheated air be drawn right back into the cooler?
     
  9. FreedomEclipse

    FreedomEclipse ~Technological Technocrat~

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    dont forget that most people will either have a sidepanel or have a 80/92/120mm fan on the side of their case (maybe i was lucky - I have a 'hex mesh' sidepanel on my case)

    Ive got the first one & I dont have any issues at all because its right next to my 120mm rear exhaust fan
     
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  10. tkpenalty New Member

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    I would have even pressure in a case. But Negative if you cant balance it; as in suck. For that heatsink it should blow.
     
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  11. Fuse-Wire

    Fuse-Wire New Member

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    i would have hot air being blown into the back of the case, an cold air being drawn from a fan port in the front over the fan n heatsink, but thats me and nothing i try works.
     
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  12. Widjaja

    Widjaja

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    I had my heatsink shipped to me with the fan around the wrongway (blowing out) I didn't notice until later.
    When I truned the fan around the right way the temps dropped 3-4deg if I can remember correctly.
     
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  13. d44ve New Member

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    there is very little differance either way


    EDIT : I misread what you wanted to knnow.

    There is very little differance if you have the same ambient temp on both sides.... otherwise, you want to have which ever way is blow\pulling the coolest air
     
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  14. tigger

    tigger I'm the only one

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    i dont personally like coolers that blow the hot air onto your mb.
     
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  15. Nicksterr New Member

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    intake =p
     
  16. Polaris573

    Polaris573 Senior Moderator

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    Please be mature and keep the thread on topic. All off topic posts have been edited or deleted.

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