PSU position in ATX case.

Discussion in 'Community Discussion' started by Handle, Aug 13, 2014.

  1. Handle macrumors regular

    Joined:
    Apr 16, 2013
    #1
    It's been over a decade since I have overclocked/watercooled/etc.

    I was just looking at what is available today and noticed that just about every ATX computer case now has the power supply position at the bottom. In the past they were always at the top.

    I was just curious if there was a reason for this change. Thanks.
     
  2. QuantumLo0p macrumors 6502a

    QuantumLo0p

    Joined:
    Apr 28, 2006
    Location:
    U.S.A.
    #2
    I would think to keep its weight down low and it doesn't make much difference as far as transferring its heat. Opting for liquid cooling usually puts the radiator top center or top back considering the mobo is higher in many ATX cases. I have an insanely large, high air flow case which is overkill so I'm going to try something more compact and I definitely would not locate my 1000w psu (super heavy) at the top of a case; trying to keep the CG down low.
     
  3. hallux macrumors 68020

    hallux

    Joined:
    Apr 25, 2012
    #4
    With the PSU being low, it can draw fresh (cool) air in. Most PSU's these days have their own fans and exhaust out the back of the case, causing minimal impact on the overall heat inside the case.
     
  4. Handle thread starter macrumors regular

    Joined:
    Apr 16, 2013
    #5
    That's the way it always was back when I was overclocking my Pentium 4 Northwood 150% :D The PSU was at the top of the case and had a fan that exhausted outwards.

    Maybe it was sucking in too much hot air from the top of the case so they put it at the bottom and gave it it's own intake too.
     
  5. jav6454 macrumors P6

    jav6454

    Joined:
    Nov 14, 2007
    Location:
    1 Geostationary Tower Plaza
    #6
    PSUs on the bottom of cases tend to bring in cool air from outside and expel the now hot air through the back.

    There are several cases with PSUs on the top still, but I would advise using one of those if your main usage is boring office/home stuff. All gaming or overlocking needs thermal efficiency which a top mounted PSU won't be good at.
     
  6. KingYaba macrumors 68040

    KingYaba

    Joined:
    Aug 7, 2005
    Location:
    Up the irons
    #7
    Slightly cooler temps, I imagine. Having an intake fan made a noticeable difference on my end and keeping cables tied and neatly tucked away behind the motherboard helped with airflow.
     
  7. Handle thread starter macrumors regular

    Joined:
    Apr 16, 2013
    #8
    Wow, I remember taking a razor blade and cutting each individually wire of a flat IDE cable off so that it could be taped together in order to get more airflow in the case. That was before they made round cables. The good old days :p
     
  8. maflynn Moderator

    maflynn

    Staff Member

    Joined:
    May 3, 2009
    Location:
    Boston
    #9
    I have a tower case that has the power supply on the top - I forget the make of it. When I bought it, I loved the case and the cooling ability it had. The computer is largely unused as this point however
     
  9. rrl macrumors 6502

    rrl

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    Jul 27, 2009
    #10
  10. Handle thread starter macrumors regular

    Joined:
    Apr 16, 2013
    #11
  11. rrl macrumors 6502

    rrl

    Joined:
    Jul 27, 2009
    #12
  12. hallux macrumors 68020

    hallux

    Joined:
    Apr 25, 2012
    #13
    It's actually not just for the cooling efficiency of the entire system. The PSU is more efficient electrically if it's cooler. Pulling hot air from the rest of the system defeats that efficiency.
     

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