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Question about push/pull on hybrid GPU

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tresnugget
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2022/07/06 20:01:08 (permalink)
So just got the 3090 Ti KPE and also the new Lian Li Uni Fan Infinity fans

The previous Uni Fans had the ARGB and PWM cables as 2 different connectors however the new fans are just 1 proprietary 7 pin connector that goes into the controller. The good news is the controller can control fan speed based on GPU temps but the bad news is it can't plug directly into the GPU like before.

So if I do push/pull with these fans pushing and some noctuas (or the included evga fans) in the back pulling, they're going to be running at different speeds.

Let's say somehow the Lian Li software doesn't act right and spins the fans on the GPU at like 20% but I'm gaming and the fans connected to the GPU's PWM are spinning at say 60%, would this situation net the same, worse, or better performance than if I only had one set of fans running off of the GPU's fan headers at 60%? I guess for simplicity's sake let's just assume the specs of both fan types are the exact same.

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    the_Scarlet_one
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    Re: Question about push/pull on hybrid GPU 2022/07/07 03:34:03 (permalink)
    Push pull with matched fans nets around 1-2 degrees lower temperature.. mismatching will probably provide the same results as just using push or pull.

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    tresnugget
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    Re: Question about push/pull on hybrid GPU 2022/07/07 04:09:15 (permalink)
    the_Scarlet_one
    Push pull with matched fans nets around 1-2 degrees lower temperature.. mismatching will probably provide the same results as just using push or pull.

    After doing some research I found some where there were cases where some got a couple extra degrees cooler, some got a couple extra degrees warmer. Guess only one way to find out how these do.

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    kraade
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    Re: Question about push/pull on hybrid GPU 2022/07/07 04:43:36 (permalink)
    I run some Gen 1 unifans on EK SE 360, and use the controller with lian li connect v1 and set to a velocity I can't really hear much, about 1571 rpm and leave it , it moves a good amount of air for the sound.


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    IRanNaked
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    Re: Question about push/pull on hybrid GPU 2022/07/09 14:35:20 (permalink)
    So what is better? 
    Just push or just pull?

    Doesn't seem to make much sense to do a push/pull configuration as your spending more than the difference in cooling
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    tresnugget
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    Re: Question about push/pull on hybrid GPU 2022/07/09 14:54:28 (permalink)
    IRanNaked
    So what is better? 
    Just push or just pull?

    Doesn't seem to make much sense to do a push/pull configuration as your spending more than the difference in cooling

    Price doesn't really matter. I'm looking for better performance when benching and better aesthetics.

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    kraade
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    Re: Question about push/pull on hybrid GPU 2022/07/09 15:40:21 (permalink)
    not for nothing but I would think you would want more rpm on the fan that pulls, as long as the pusher fan is 60% or better I don't believe it would ever impede flow, now the EVGA Hybrid fans are nice and move decent air, I bet they are stronger than the lian li uni's, they may be able to run faster as the puller and with the pusher fans , make less noise.


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    tresnugget
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    Re: Question about push/pull on hybrid GPU 2022/07/09 15:49:54 (permalink)
    kraade
    not for nothing but I would think you would want more rpm on the fan that pulls, as long as the pusher fan is 60% or better I don't believe it would ever impede flow, now the EVGA Hybrid fans are nice and move decent air, I bet they are stronger than the lian li uni's, they may be able to run faster as the puller and with the pusher fans , make less noise.

    Yeah I think you're right. They seem solid and the specs are different from what I've seen online with fans that were branded differently with the same model number. Those were 2000 rpm and the fans the KPE come with are 2200 rpm while the uni fans are 2100. I like the look of the KPEs with the unifans on the top and the bottom. I was honestly expecting them to suck but they're pretty good.

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    HeavyHemi
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    Re: Question about push/pull on hybrid GPU 2022/07/09 16:07:49 (permalink)
    Based on my personal experience, I dropped an average of 5C under load on my 1080 Ti pulling some 330 watts with push/pull Scythe GTs. I used dual AP-14's with the push fan at 80% and the pull fan at 90% off the mother board fan headers. It was quieter than the fan on my Dish receiver and gave me another 10 watts or so not used running the rad fan.
    Things have improved somewhat with now being able to control the rad fan speed now. The Hybrid for the 1080 Ti had a fixed 100% fan speed. Serious design flaw.
    I have a Hybrid cooler coming for my 3080 Ti. Should be here Tuesday.

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    quick4dr
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    Re: Question about push/pull on hybrid GPU 2022/07/09 17:11:05 (permalink)
    I just run 3000 rpm industrial fans on ambient and a tek icon on ln2 don’t need push and pull if you got good fans in push
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    HeavyHemi
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    Re: Question about push/pull on hybrid GPU 2022/07/09 19:27:52 (permalink)
    quick4dr
    I just run 3000 rpm industrial fans on ambient and a tek icon on ln2 don’t need push and pull if you got good fans in push

    You don't need  ln2 either. No matter how good your fans are, the same quality fans will provide more flow at a lower noise level and better temp in push/pull. You apparently do not care about noise at all.

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    quick4dr
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    Re: Question about push/pull on hybrid GPU 2022/07/09 23:51:46 (permalink)
    Kingpin cards are made for ln2. I use noctua controller. If it’s got rgb it’s not a good fan for performance.
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    zippytek
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    Re: Question about push/pull on hybrid GPU 2022/07/10 05:59:23 (permalink)
    quick4dr
    Kingpin cards are made for ln2. 



    true, people still want to daily them tho. with stock having normalized, beyond just the flex photos there really isn't much need for a 3090 in a gaming pc anyway. if you need the performance bump or vram, fan noise should be an acceptable trade off.
     
    my bench rad has 9x 3000rpm iPPC noctuas lol it sounds like a jet engine at max speed
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    GTXJackBauer
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    Re: Question about push/pull on hybrid GPU 2022/07/10 06:37:58 (permalink)
    A12 Noctuas or AP15s are one of the best rad fans imo for low-mid FPI rads.  They just don't have the bling from LEDs.

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    quick4dr
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    Re: Question about push/pull on hybrid GPU 2022/07/10 07:29:54 (permalink)
    zippytek
    quick4dr
    Kingpin cards are made for ln2. 



    true, people still want to daily them tho. with stock having normalized, beyond just the flex photos there really isn't much need for a 3090 in a gaming pc anyway. if you need the performance bump or vram, fan noise should be an acceptable trade off.
     
    my bench rad has 9x 3000rpm iPPC noctuas lol it sounds like a jet engine at max speed
    I use the same fans I actually bought the controllers I can make them silent if needed. When benching I turn them full jet engine.
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    hinanin
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    Re: Question about push/pull on hybrid GPU 2022/07/10 07:40:30 (permalink)
    The slower fan may impede some of the airflow. At low speeds push/pull makes a big difference and at high speeds it will only be a few degrees as mentioned previously.

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    quick4dr
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    Re: Question about push/pull on hybrid GPU 2022/07/10 14:35:16 (permalink)
    Depends on fans used and setup ive used push pull in the past. I use mo-ra 420 pro with 9x 140mm in push I stay below 40c on 3090 or 6900xt with quiet settings. Benching and overvolted with evc2 I turn it up 600w power draw. Max temp 41c with 22c ambient.
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    808sting
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    Re: Question about push/pull on hybrid GPU 2022/07/11 03:02:01 (permalink)
    Push/pull is pretty much deminishing returns with the 2080KP, 3090FTW3 hybrid, and 3090 KP.  The hybrid helps with more consistent GPU boost at room temps.  I mainly use push/pull to reduce noise levels by running a less agressive fan curve and help with static pressure.  Need to make sure the fan frame seats well and doesn't leak air.  The easiest bench test gains when using the OE AIO is to have a portable AC with a flex duct directed at the KP.  Without classy tool and OE XOC bios, could get mid 15K pretty easy on PR with my 3090 KP pulling close to 500w.  Used (6) Noctua PPC-2000, but switched them out to Nidec Gentle Typhons.  Main difference for me was noise and frequency sound characteristics.

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