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Can i use my 8800GTX as a PhysX card?

Discussion in 'NVIDIA' started by MightyG80, Feb 27, 2009.

  1. MightyG80 New Member

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    Im thinking of buying a GTX285 next week... So i want to ask this, will i be able to use my old 8800GTX as a secondary PhysX card?

    Also, if i can, how will i do it? Connect the 2 cards via SLI? Will i have to install any special drivers ? Or will the system freak-out detecting 2 graphic cards?

    Thanks. :)
     
  2. RevengE

    RevengE

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    You cannot run A 285 and a 8800gtx in SLI..It has to be the same series of cards Example x2 8800 GTX's would be fine or rather x2 285s. PhysX is a joke right now They might improve it down the road, as of right now I would not worry about it, Yes you could use it as a Physx Card but you cannot use SLI with a 285.
     
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  3. Tatty_One

    Tatty_One Senior Moderator Staff Member

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    Yes you can run the 8800GTX as a dedicated Physx card, do not use the SLi bridge, put the 285 in the primary Pci-e slot, the 8800 in the secondry, you will be asked to load drivers for the 8800, then re-boot, go to the physx proggie in control panel and it should be identified or give you the option to enable it.
     
  4. Error 404

    Error 404

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    I'm pretty sure the GTX 200 range has its own inbuild PhysX proc that is still on the core, but isn't part of the GPU; PhysX uses that instead of stealing SPUs from the main GPU.
    So an 8800 GTX wouldn't do much at all for anything other than make noise, heat, and use a lot of power for nothing.
     
  5. MightyG80 New Member

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    So, basically, what you are saying is that i can, but i shouldnt bother?
     
  6. Error 404

    Error 404

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    Yeah, since the GTX 285 should take care of the PhysX by itself without affecting its graphics processing speed, the 8800 GTX would be like painting a rocket red to make it go faster.
     
  7. Tatty_One

    Tatty_One Senior Moderator Staff Member

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    The 285 will take a performance hit rendering and running Physx, albeit a small one, it does not have dedicated SP's to do the job, it's just very powerful and efficient, CUDA 3/4 has really fined tuned the Physx process but you can still see some small gains from a dedicated card (especially a powerful one like the 8800GTX), averaging around 5-8% in FPS..... is it worth it therefore?...... only you can decide that.
     
  8. Tatty_One

    Tatty_One Senior Moderator Staff Member

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  9. MightyG80 New Member

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    Thanks guys :)
     
  10. Error 404

    Error 404

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    Well, if you are going to run a PhysX card, then I'd reccommend something like an 8400 GS; that will easily do dedicated PhysX, use much less power and produce much less heat than a big 8800 GTX.
     
  11. MightyG80 New Member

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    That i am thinking too. There is one more reason i might do excactly that - My brother has a 8800GTX in his rig also and i may as well give him mine to use it in SLI. So i am considering this last option you said error 404 - if i go dedicated PhysX that is ( im still thinking about it )
     
  12. Tatty_One

    Tatty_One Senior Moderator Staff Member

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    Agreed, but actually he wont see anywhere near the Physx perrformance improvements over the 8800GTX but it is a fine balancing act, the 8800GTX would be overkill IMO but results with the 8400GS only show marginal improvements apparently, the 9600GSO tested in the link I posted would seem the optimum. Them 8800GTX's are pretty power hungry and it certainly aint worth it if you have to upgrade the damn power supply to run it!
     
  13. Error 404

    Error 404

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    A 9600 GSO or GT would make a perfect PhysX card, especially if you have the spare cash.
    MightyG80, if you consider getting a GSO or something similar, you should consider looking at the Folding@Home section; join the TPU Folding@Home team, help fight diseases, and put the time your graphics cards are idle to good use!
     
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