Dedicated Physx PCI 8x speed question using a 980 Ti

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keldia

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Feb 5, 2012
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I have a ASUS Maximus IV Gene-Z/GEN3 motherboard and a i7-2700k CPU overclocked to 4.5ghz. The motherboard normally runs 1 PCI 3.0 lane at 16x/- or 2 PCI 3.0 lanes at 8x/8x

I'm upgrading to a EVGA 980 Ti 6gb for my primary graphics card and I have an old EVGA 660 that I will be replacing. I am considering keeping the 660 in my system as a dedicated PhysX card so that the CPU and the 980 Ti are left free to work without having to also do PhysX as well. I have a 850w PSU so it should in theory be able to handle both cards at once.

All I am concerned with is maximizing my framerate in PhysX games. Specifically I want max out the overclock on the 980 Ti then turn on ultra settings in Witcher 3 and enable that lovely hair physics engine for permanent 60fps in 1440p.

My question is if i do this then it will bring the 980 TI PCI lane from 16x down to PCI 3.0 8x, would I get more performance from a 8x pci lane running a 980 Ti with a second PCI 3.0 8x pci lane using the GTX 660 to do dedicated physx, or would I be better off doing a single card 980 Ti to keep a single 16x PCI 3.0 lane and use the CPU for PhysX instead?
 
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renz496
Even at x8 it should be fine with 980ti. Personally I think 980Ti should be able gpu accelerated PhysX just fine without the need of dedicated PhysX. But since you already got that 660 you can use it as dedicated PhysX card and see how the performance goes.

BTW don't bother use dedicated PhysX card if the only reason to use it was The Witcher 3. The game did not use gpu PhysX at all. Nvidia already explain this in their graphical guide for the witcher 3 at GeForce.com. all physics effect in the game (grass, destruction, hair, fur) were done on CPU. The things that makes Hairworks very demanding was not PhysX but extreme tessellation and anti aliasing used on it.
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renz496

renz496

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Jun 16, 2009
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Even at x8 it should be fine with 980ti. Personally I think 980Ti should be able gpu accelerated PhysX just fine without the need of dedicated PhysX. But since you already got that 660 you can use it as dedicated PhysX card and see how the performance goes.

BTW don't bother use dedicated PhysX card if the only reason to use it was The Witcher 3. The game did not use gpu PhysX at all. Nvidia already explain this in their graphical guide for the witcher 3 at GeForce.com. all physics effect in the game (grass, destruction, hair, fur) were done on CPU. The things that makes Hairworks very demanding was not PhysX but extreme tessellation and anti aliasing used on it.
 
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