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GTX 1080 TI FTW3 SLI Physx misunderstood

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itzik198
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2019/02/26 17:26:06 (permalink)
i have gtx 1080 ti with sli bridge HB 
both is FTW3. 
in Nvidia control panel i checked SLI enable maximum 3d performance blah blah... and the second card ( the one that IS NOT connected to the monitor) is physx processor. 
i notice that if i check ''Phsyx Dedicated Card'' option SLI Disabled. 
1. Why?
2.what is the difference ? any way second card is physx. it like in dedicated physx he working harder to processor physx? or the meaning of this is in a scenario the second card is random and i want it for physx only ? 
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    bcavnaugh
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    Re: GTX 1080 TI FTW3 SLI Physx misunderstood 2019/02/26 17:28:02 (permalink)
    Sounds Normal to me.
    "PhysX Dedicated Card'' means No GPU not that different than selecting the CPU as the Dedicated PhysX
    SLI needs the GPU part of the Graphics Card to use it as part of the SLI or 2-Way SLI that is.
    post edited by bcavnaugh - 2019/02/26 17:32:49

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    AHowes
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    Re: GTX 1080 TI FTW3 SLI Physx misunderstood 2019/02/26 17:37:38 (permalink)
    Basicly, if ya want it to be a physx card then dont do SLI. Sli is about running both card together as one. Ya cant so that and also run the 2nd card as a dedicated physx card as well.. it's one or the other.

    If ya want both you'll need to use a 3rd card that's not connected with a SLI connection and selected as a physx card.

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    Digital_Fuzion
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    Re: GTX 1080 TI FTW3 SLI Physx misunderstood 2019/02/26 18:11:21 (permalink)
    While we are on this subject matter. Will you see better in-game visual quality enabling PhysX over using the CPU? I would assume the NVIDIA PhysX will show better visuals regarding in-game PhysX vs the CPU which would be limitedwhat you will visually see. What are the cons and pros with using the CPU over NVIDIA's PhysX? in SLI? and in none-SLI mode?
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    Sajin
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    Re: GTX 1080 TI FTW3 SLI Physx misunderstood 2019/02/26 18:51:33 (permalink)
    itzik198
    i have gtx 1080 ti with sli bridge HB 
    both is FTW3. 
    in Nvidia control panel i checked SLI enable maximum 3d performance blah blah... and the second card ( the one that IS NOT connected to the monitor) is physx processor. 
    i notice that if i check ''Phsyx Dedicated Card'' option SLI Disabled. 
    1. Why?
    2.what is the difference ? any way second card is physx. it like in dedicated physx he working harder to processor physx? or the meaning of this is in a scenario the second card is random and i want it for physx only ? 





     
    The above pic shows sli functioning, but the #1 card will do majority of the physx processing.
     
     

     
    The above pic shows sli disabled because you chose to dedicate gpu #1 strictly to physx. Maximize 3d performance on with a dedicated gpu selected is the same as disable sli on with a dedicated gpu selected.
     
    The difference between the two is that config/picture #1 allows sli to function while card #1 does majority of the physx processing, and config/picture #2 disables sli, and forces both cards to operate independently with card #2 doing all the normal rendering, and card #1 doing only the physx rendering.
     
     
     


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    ty_ger07
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    Re: GTX 1080 TI FTW3 SLI Physx misunderstood 2019/02/26 19:09:40 (permalink)
    Digital_Fuzion
    While we are on this subject matter. Will you see better in-game visual quality enabling PhysX over using the CPU? I would assume the NVIDIA PhysX will show better visuals regarding in-game PhysX vs the CPU which would be limitedwhat you will visually see. What are the cons and pros with using the CPU over NVIDIA's PhysX? in SLI? and in none-SLI mode?

    Very few games support NVIDIA PhysX. Therefore, selecting a dedicated PhysX card often accomplishes nothing other than creating some form of waste or failure to reach full potential.

    The first question should always be: does the game support PhysX?

    SLI enabled with PhysX selected to "Auto-select" will almost always perform better. "Auto-select" doesn't necessarily mean that the CPU will do the PhysX. Either one of the cards can perform PhysX calculations while SLI is enabled as long as you keep the choice as "auto-select". The NVIDIA driver will often "auto-select" the secondary SLI card to do PhysX processing AND still properly perform SLI rendering operations. Best of both worlds. Especially good when 99% of the games you play don't support PhysX and therefore you aren't wasting SLI potential by manually telling it to refuse SLI operations.

    Visually difference? I doubt it, either way.

    Almost always, forcing it to do something by manually selecting a PhysX device will force it to do something which is sub-optimal. Therefore, "auto-select" is "recommended".

    The ONLY time you should EVER choose anything other than "auto-select" is if you only play certain games, use certain benchmarks, and/or use certain applications, and you have meticulously tested all options and have come to a firm conclusion that your niche usage performs best using a particular setting. Then, don't change the way you use your computer, or else you will have to do that meticulous testing all over again.
    post edited by ty_ger07 - 2019/02/26 19:23:54

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    Sajin
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    Re: GTX 1080 TI FTW3 SLI Physx misunderstood 2019/02/26 19:25:25 (permalink)
    Digital_Fuzion
    While we are on this subject matter. Will you see better in-game visual quality enabling PhysX over using the CPU? I would assume the NVIDIA PhysX will show better visuals regarding in-game PhysX vs the CPU which would be limitedwhat you will visually see. What are the cons and pros with using the CPU over NVIDIA's PhysX? in SLI? and in none-SLI mode?


    If the game supports nvidia physx you'll definitely notice better looking physx effects by not using the cpu, and you'll get higher frame rates from offloading the physx burden from the cpu.
     
    Forcing the cpu in games that support nvidia physx would do the following: Lower your overall frame rates & decrease physx visual quality. There are no pros to using the cpu in a nvidia physx supported game, unless of course the game is having issues with nvidia physx in which case you could tell the game to do physx processing on the cpu.


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    itzik198
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    Re: GTX 1080 TI FTW3 SLI Physx misunderstood 2019/02/27 11:39:09 (permalink)
    Sajin
    Digital_Fuzion
    While we are on this subject matter. Will you see better in-game visual quality enabling PhysX over using the CPU? I would assume the NVIDIA PhysX will show better visuals regarding in-game PhysX vs the CPU which would be limitedwhat you will visually see. What are the cons and pros with using the CPU over NVIDIA's PhysX? in SLI? and in none-SLI mode?


    If the game supports nvidia physx you'll definitely notice better looking physx effects by not using the cpu, and you'll get higher frame rates from offloading the physx burden from the cpu.
     
    Forcing the cpu in games that support nvidia physx would do the following: Lower your overall frame rates & decrease physx visual quality. There are no pros to using the cpu in a nvidia physx supported game, unless of course the game is having issues with nvidia physx in which case you could tell the game to do physx processing on the cpu.




    what if SLI is Enabled BUT in nvidia control panel under ''manage 3d settings'' under '' program settings '' i choose  SLI rendering mode : SINGAL GPU and the second graphic card is checked as '' Physx Processor '' . 
    what will happend this specific game will use the second card for physx ? 
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    Sajin
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    Re: GTX 1080 TI FTW3 SLI Physx misunderstood 2019/02/27 12:02:41 (permalink)
    itzik198
    Sajin
    Digital_Fuzion
    While we are on this subject matter. Will you see better in-game visual quality enabling PhysX over using the CPU? I would assume the NVIDIA PhysX will show better visuals regarding in-game PhysX vs the CPU which would be limitedwhat you will visually see. What are the cons and pros with using the CPU over NVIDIA's PhysX? in SLI? and in none-SLI mode?


    If the game supports nvidia physx you'll definitely notice better looking physx effects by not using the cpu, and you'll get higher frame rates from offloading the physx burden from the cpu.
     
    Forcing the cpu in games that support nvidia physx would do the following: Lower your overall frame rates & decrease physx visual quality. There are no pros to using the cpu in a nvidia physx supported game, unless of course the game is having issues with nvidia physx in which case you could tell the game to do physx processing on the cpu.




    what if SLI is Enabled BUT in nvidia control panel under ''manage 3d settings'' under '' program settings '' i choose  SLI rendering mode : SINGAL GPU and the second graphic card is checked as '' Physx Processor '' . 
    what will happend this specific game will use the second card for physx ? 


    Then you'll be disabling sli, and forcing the 2nd gpu to do only physx.


    See my current build here: https://forums.evga.com/My-bench-rig-unlimited-power-m3596024.aspx
    RTX 2080 Ti 4-way SLI?!?!: https://forums.evga.com/RTX-2080-Ti-4way-SLi-set-by-yours-truly-m2954756.aspx
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    HeavyHemi
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    Re: GTX 1080 TI FTW3 SLI Physx misunderstood 2019/02/27 12:27:19 (permalink)
    itzik198
    Sajin
    Digital_Fuzion
    While we are on this subject matter. Will you see better in-game visual quality enabling PhysX over using the CPU? I would assume the NVIDIA PhysX will show better visuals regarding in-game PhysX vs the CPU which would be limitedwhat you will visually see. What are the cons and pros with using the CPU over NVIDIA's PhysX? in SLI? and in none-SLI mode?


    If the game supports nvidia physx you'll definitely notice better looking physx effects by not using the cpu, and you'll get higher frame rates from offloading the physx burden from the cpu.
     
    Forcing the cpu in games that support nvidia physx would do the following: Lower your overall frame rates & decrease physx visual quality. There are no pros to using the cpu in a nvidia physx supported game, unless of course the game is having issues with nvidia physx in which case you could tell the game to do physx processing on the cpu.




    what if SLI is Enabled BUT in nvidia control panel under ''manage 3d settings'' under '' program settings '' i choose  SLI rendering mode : SINGAL GPU and the second graphic card is checked as '' Physx Processor '' . 
    what will happend this specific game will use the second card for physx ? 




    Actually in the way you described it, if you check the 2nd GPU as the PhysX, SLI would already be disabled and the game setting would have no effect. You cannot do your scenario.

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    HeavyHemi
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    Re: GTX 1080 TI FTW3 SLI Physx misunderstood 2019/02/27 12:31:34 (permalink)
    Sajin
    itzik198
    Sajin
    Digital_Fuzion
    While we are on this subject matter. Will you see better in-game visual quality enabling PhysX over using the CPU? I would assume the NVIDIA PhysX will show better visuals regarding in-game PhysX vs the CPU which would be limitedwhat you will visually see. What are the cons and pros with using the CPU over NVIDIA's PhysX? in SLI? and in none-SLI mode?


    If the game supports nvidia physx you'll definitely notice better looking physx effects by not using the cpu, and you'll get higher frame rates from offloading the physx burden from the cpu.
     
    Forcing the cpu in games that support nvidia physx would do the following: Lower your overall frame rates & decrease physx visual quality. There are no pros to using the cpu in a nvidia physx supported game, unless of course the game is having issues with nvidia physx in which case you could tell the game to do physx processing on the cpu.




    what if SLI is Enabled BUT in nvidia control panel under ''manage 3d settings'' under '' program settings '' i choose  SLI rendering mode : SINGAL GPU and the second graphic card is checked as '' Physx Processor '' . 
    what will happend this specific game will use the second card for physx ? 


    Then you'll be disabling sli, and forcing the 2nd gpu to do only physx.




    There are two really rare exceptions to the rule. 3-way and 4-way SLI. You can dedicate a GPU to PhysX and the other 2 or 3 GPU's will operate in SLI. I ran 3-way 470's for a bit and Mafia 2 ran the best in that configuration. Whereas the Batman titles ran best in 3-way with PhysX on auto.

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    Delirious
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    Re: GTX 1080 TI FTW3 SLI Physx misunderstood 2019/02/27 12:36:03 (permalink)
    In some games, sli has very little or low  benefit, so you can disable sli and use one card for graphics and assign another to physx.  Provided the game has it. 

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    HeavyHemi
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    Re: GTX 1080 TI FTW3 SLI Physx misunderstood 2019/02/27 13:51:34 (permalink)
    Delirious
    In some games, sli has very little or low  benefit, so you can disable sli and use one card for graphics and assign another to physx.  Provided the game has it. 





    The simplest method is to do this per game profile to single GPU, which you can do instead of changing it globally. Most of the game's profiles are natively set correctly when then driver is installed.

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