SLI + Dedicated PhysX Card?

[Oshino Shinobu]

So I recently got two 780Tis and I love them, but I take serious FPS drops in games like AC4 when I turn on PhysX (Like 60FPS to 30). I have my old 670 just lying around gathering dust and was wanting to put it to use. 

 

I was wondering if it's possible to run the two 780Tis in SLI and have the 670 in a PCI-E 4x slot just for running PhysX. Do you think this is possible? 

[Ryan Leech]

Yes

[FloRolf]

i dont think nvidia card are able to run in a 4x slot.

[piplupgao]

i dont think nvidia card are able to run in a 4x slot.

they can with some 3rd party drivers and such

[helping]

don't bother.

A pair of 780TI's will do physx compute better than a 670.

[edschofield15]

You should check in the nvidia driver that PhysX is not on the CPU, you should set it to the 2nd GPU.

[Oshino Shinobu]

You should check in the nvidia driver that PhysX is not on the CPU, you should set it to the 2nd GPU.

PhysX is set to the 2nd GPU. This was more hypothetical than anything else. I'm not even sure if my PSU could cope with it. 

[Ninety1Nine]

So I recently got two 780Tis and I love them, but I take serious FPS drops in games like AC4 when I turn on PhysX (Like 60FPS to 30). I have my old 670 just lying around gathering dust and was wanting to put it to use. 

 

I was wondering if it's possible to run the two 780Tis in SLI and have the 670 in a PCI-E 4x slot just for running PhysX. Do you think this is possible? 

 

Completely possible. I upgraded to a 770 from a 660ti. I have the 770 running my middle screen, and the 660ti in a PCI-E 2.0 x4 slot running my 2 side screens as well as doing PhysX. It's just a setting in the NVIDIA Control panel.

A 670 is a bit overkill for just PhysX though. If you want to get some money back, I used to have a dedicated 640 for PhysX and the GPU utilization on it was pretty low while still keeping my FPS up above 60. Get one used though, got mine for half the price, and works just as great.

 

I say, go for it.

 

 

EDIT: How big is your PSU?

 

they can with some 3rd party drivers and such

I have mine running without any extra drivers.

[Oshino Shinobu]

 

 

EDIT: How big is your PSU?

 

 

860W. Even if it can run it, it will be pushing it to the edge.

[piplupgao]

 

I have mine running without any extra drivers.

what card is it?

[Faa]

i dont think nvidia card are able to run in a 4x slot.

They can.

 

they can with some 3rd party drivers and such

That's only needed when you SLI a 3rd card in a x4 slot. In this case he isn't obviously sli'ing his 670 with his two 780ti's. Although you can't sli like that

[Ninety1Nine]

what card is it?

 

I have a MSI 660ti PE running right now and I used to use a 640 in the PCI-E 2.0 x4 slot. I also had a XFX AMD 5600 series card running in it at one point before I sold it.

 

Keep in mind this was a x16 lane at x4 speed and not SLI'd.