Why are blower cooling bad ?

Discussion in 'Video Cards' started by honegod, Aug 4, 2019.

  1. Snowdog

    Snowdog [H]ardForum Junkie

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    Window AC is noisy as hell. Also a Window AC will ice up long before it starts outputting -10C air. I have seen them ice up in open air trying to get down to 20C.
     
  2. noko

    noko [H]ardness Supreme

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    no, enclosed loop means just that, moisture is not going to come in to form ice. A heat up period of over 0c can also be used periodically, to melt any ice off of the evaporator coils in the A/C unit. Yes, some A/C units are more noisy then others, while that noise is being directed/muffled in this situation your right, some may not like the noise and it would not be for them. There are also options where you can have a remote A/C unit and duct the air to the pc. I did not have an issue with noise since where I live, I hear not only my own A/C unit but neighbors as well. Also note this is a period of time or tail end of it where folks were using delta fans (I was one of them) that was louder than any A/C unit I've own so for me it was a noise reduction.

    For a period of time, very short actually, I was below 0c, that temperature is not too friendly with mechanical moving devices like fans and hard drives, fans would make noise, hard drives would fail. Reason why I ended up above 5c range which seems to alleviate issues with hard drives and fans.

    That is how I got my Radeon 9700 Pro from 325mhz all the way up to 425mhz, normally I kept it around 410mhz. Not only the card was way beyond it's time, the OC made it even more awesome. It was a Tyan 9700 Pro, probably the first card that had sensors and software that showed the different voltages, which was key for the hardware volt mod I did. Made a circuit with three pots to hook up to the different voltage controllers and used the Tyan software to adjust the voltages to optimize the OC using PowerStrip (was first program that could OC ATi cards) I also modified the HSF on the card. The image shows how the cold air which could be below freezing, blew right over the card as well as the CPU, motherboard, ram etc. This was some 16 years ago lol. Used that case setup for around 10 years or so with different motherboards, GPUs and worked wonders for OCing over and over again. PC cases back then were not as opened as they are now. Today I have different ideas. Some old timer nostalgia in the end.


    OVmod.jpg

    R9700proVoltModed.jpg

    ColdairIn.jpg
     
    Last edited: Aug 14, 2019 at 5:36 AM
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  3. Snowdog

    Snowdog [H]ardForum Junkie

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    Pics of the AC side connections?
     
  4. noko

    noko [H]ardness Supreme

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    Your looking at it. I don’t have pictures of the A/C unit plenum, remember these are some old ass pictures. Anyways the black corrugated plastic pipe is mounted to the case window which pivots, the fitting snaps on and off with ducting going to it. You can actually see the exhaust plenum in the back. All other holes were sealed. Today cases makes this method impractical in my opinion. Case was insulated throughout, rubber insulation.

    This cooled everything, GPU CPU, ram motherboard power supply etc. I believe in the above picture the CPU was an Athlon 1700 OC to 2.1 ghz +
     
  5. Snowdog

    Snowdog [H]ardForum Junkie

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    The problem is Window AC units don't have hose attachments. they are big flat intakes with vent outlets. Like this:
    itioner-mechanical-rotary-controls-2-way-air-flow-eer-11-1-auto-restart-covers-up-to-150-sq-ft-3.jpg

    Not really very practical for doing closed loop on a PC. Even if you get something like this to work, still noisy as hell, and if you say, "You need AC anyway", well you need another one to cool your room. If this one is closed loop on your PC, it isn't cooling your room.

    If I was going to go that nuts cooling, I think I would simply do some kind of liquid cooling loop with ice water cooling. Much quieter, and much less cumbersome. Something like this:

    https://www.techpowerup.com/forums/...-cooling-now-over-3-years-operational.222083/


    Or, you know, just do the sane thing and start with a properly designed quiet air cooling for both CPU and GPU.
     
    Last edited: Aug 15, 2019 at 8:17 AM
  6. noko

    noko [H]ardness Supreme

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    Not practical today due to current case designs but a box maybe. As for noise, if you already have a window unit - your not going to add more noise and most likely will reduce the noise since it will be directed into something. Not sure the point, yes for some an A/C unit they can't handle, the noise that is. As for hookup, a little imagination, some framing and you can have a perfect in/out duct setup on that A/C unit above. Now I won't even have to worry about that aspect since basically the PC will have it's own small room with it's own dedicated A/C unit. I could even sound isolate the hell out of it ( I do have a number of sound tiles).

    As for ice water, not sure what you are driving there, a chill water system sounds great except if your system is exposed, as in moist air, you can get condensation. If an enclosed system where the chill water is used to circulate air through a heat exchanger (taking moisture out and preventing going below the dew point inside the case) and that water cools GPU, CPU, anything else -> To me that would be golden/ideal. Noise can be isolated from the work/play space to some other area while the chill water is pumped to and from the system.

    Now when are serious overclockers practical :D.
     
  7. D-EJ915

    D-EJ915 Gawd

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    Yep, from GTX 480 to GTX 580 there were some die changes but the biggest difference in the cooling was definitely moving from heatpipe block on the 480 to vapor chamber on the 580. The 580s ran like 10-15 C cooler sometimes lol. I ran 480s in triple SLI for a while and that was like a furnace lol.

    With SLI effectively being dead blower cards don't serve much purpose for consumer cards anymore. OEMs will still have blowers made since it makes it easier for them to implement into their case designs.
     
  8. Dayaks

    Dayaks [H]ardness Supreme

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    I did a chilled water loop under 0C with peltiers. I put the mobo in a cooler chest with desicate and sealed it so I didn’t have to worry about condensation. Also nice since mechanical moving parts was to a minimum.
     
  9. kirbyrj

    kirbyrj [H]ard as it Gets

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    It really all depends on the case air flow. If there isn't a lot of air movement, the blower is preferable to exhaust the hot air.
     
  10. Lepardi

    Lepardi Limp Gawd

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    Blower cooling is better, if done properly, because it helps removing heat from the case!

    My MSI GTX 980 OCV1 blower has been running with a silent 80C fan profile for 5 years. Still running flawlessly.
     
  11. Dayaks

    Dayaks [H]ardness Supreme

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    A 980 is also a 165W card. A two slot blower works great at that TDP.
     
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  12. Soulwrath

    Soulwrath n00b

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    so then in a case like the phanteks mitx enthoo evolv, the blower fan would be better than the AIB coolers correct? but the fan curve speed will also be louder
     
  13. kirbyrj

    kirbyrj [H]ard as it Gets

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    My biggest problem with all of those mITX towers is that they completely starve the video cards of airflow. Personally, I think a blower style cooler is better in that case.
     
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  14. Soulwrath

    Soulwrath n00b

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    Thats what i was thinking as well thanks for confirming
     
  15. Snowdog

    Snowdog [H]ardForum Junkie

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    Being starved of airflow, still doesn't make the blower outperform the open air cards. Open cards start off so far ahead, that even when starved they typicall still outperform blowers:

    https://techbuyersguru.com/founders...video-card-coolers-definitive-analysis?page=1
     
  16. kirbyrj

    kirbyrj [H]ard as it Gets

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    The CPU temperature is higher in the comparisons with the open air card up to 5C in the ITX case. That article is specifically testing GPU temperatures, but not everything people do with a computer is playing games and being GPU bottlenecked, so higher CPU temps might be a factor.

    Further, that article is very case specific. In the case of the Enthoo Evolv ITX, (which the question pertained to and the answer directed toward) there is a cut out for airflow that would greatly improve the GPU airflow restriction for blower cards (depending on the HDD's used) where an open air card is going to be slightly restricted by the PSU and PSU shroud.