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How To: Properly Plan And Pick Parts For An Air-Cooled PC, Part 1

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What better way to wrap up a scorching summer than with a last word on cooling? We explain the most important rules for creating ideal airflow, address the potential effectiveness of side fans, and discuss the finer points of graphics card cooling.

Airflow: Measurements And Comparisons

Of course, we wanted to quantify the claims made in the preceding pages using a number of different installation scenarios. We used an Antec Lanboy Air from one of our earlier case round-ups, making its mesh sides air-tight by covering them with cardboard. The Lanboy Air allows for both top and bottom power supply mounting. The results speak for themselves:

Looking at the exhaust air temperature from the power supply, we see the greatest advantage when it's mounted on the bottom of our test enclosure.

Here we see that systems cooled by downward-facing blowers really benefit from side ventilation.

111 Comments Comment from the forums
  • compton 08 November 2011 11:39
    After reading the charts of PSU placement and the GPU cooling diagrams, I'm even more convinced that my Lian Li PCA05-NB is a great solution. The motherboard is upside down, so that GPUs (In my case an axial fan gpu) faces towards the top. The CPU is now at the bottom back of the case and with the rear fan acting as an intake and not exhaust, you get great CPU cooling. The PSU mounts in the bottome front as well. The great part of this design is all the heat ends up in the top. As an option, you can vent the top to release the heat rising from the GPUs, but I like the case because it has very little venting. Through unusual case design and careful component selection I have an almost silent system - but with overclocked CPU and GPUs. The front fan is the exhaust, but has a bezel over it. With a few bucks worth of acoustic dampening material I can even hear myself think sometimes. I regard low temps and low noise output to be two sides of the same coin, but I know that many seem to not mind loud systems and mainly just care about temps. It's never been easier to build a near-silent system, even with high performance gear.

    If you plan ahead of time, you can make a super quiet and cool running system. It's easier to build a cool and quiet system from the start than retroactively go back and try to make a noisy (and/or hot) system quiet with great temps.

    I'll be waiting for article 2.
    Reply
  • Mark Heath 08 November 2011 12:39
    Good timing as the Australian summer approaches. You guys in the US think you have it hot :S
    Reply
  • buzznut 08 November 2011 12:55
    Guten hunger YAH!
    Reply
  • JOSHSKORN 08 November 2011 12:57
    I want my next PC to be able to play Crysis AND make me hot dogs and Iced Frappuccinos.

    All kidding aside...curious though, the test setup is on AMD CPUs. What about Intel CPUs? I would assume many of the concepts are similar.
    Reply
  • 100100 08 November 2011 13:02
    Finally! A definitive article on how to air cool effectively! :D
    Reply
  • frostmachine 08 November 2011 13:05
    Great guide. I live in a perpetually hot n dusty place. This will come in handy.

    Would be better if there's some tips on dust management.
    Reply
  • beetlejuicegr 08 November 2011 13:45
    heh i am just showing you a pic from my pc that the airflow is totally different because there is a watercooling system on the cpu, i hope that the picture is self explanatory for all.

    Reply
  • amirp 08 November 2011 13:46
    Hey I have a question... for the PSU you say to not put it in upside down (ie. with it's opening facing up into the chassis..) but this is how I have mine in my ANTEC300 case since there is little room between bottom of case and the PSU if mounted right-side up. So what should I do?!!
    Reply
  • BulkZerker 08 November 2011 14:15
    amirpHey I have a question... for the PSU you say to not put it in upside down (ie. with it's opening facing up into the chassis..) but this is how I have mine in my ANTEC300 case since there is little room between bottom of case and the PSU if mounted right-side up. So what should I do?!!
    PSU's don't pull that much air, normally. So unless your Unit kicks it's fan speed way up there then don't royy abotu it and do as suggested. If it doesn't work then you can always just flip it back to where it was.
    Reply
  • darkrydr3 08 November 2011 14:20
    BeetlejuiceGr, your cpu core temps are pushing 70 or 90 degrees C... thats hot!
    Reply