Graphics PhysX settings

I have been messing about with SLI setting as I am having issues with Far Cry 4 (again) since the last patch and decide to re-enable SLI and noticed I have to the right of SLI configuration in the Nvidia Control Panel a PhysX heading which under processor is set to Auto select (recommended).

But I also have a choice of 670 1 or 2 or CPU and underneath that dropdown box I have a tick box entitled dedicate to PhysX.

Can anyone simply explain what setting I should adopt and any other relevant information?

Thanks.

 

Dedicate to PhysX is most useful if you have two different graphics cards that you can not use with SLI. The less powerful card can be dedicated to PhysX calculation, thereby taking some of the load off the main card.

 

Definitely go with Auto-select. I had a fiddle with it a while ago and not allowing the program to sort itself out only caused issues for me...

 

If 'Auto-select' is enabled from my experience it'll always offload PhysX to the secondary GPU.

Goes without saying you should have the most capable graphics card as the primary GPU. In my rig I use the EVGA GTX 780 Ti SC as the primary since its default clocks are higher and is the more capable out of the two.

 

Cheers George.

Both cards are the same so that is not an issue.

So the consensus is leave well alone.

Cheers all.

 

What issues are you having btw? I've just updated and given it another go - nothing seems to have changed to me (for better or worse)

 

I suddenly got major stutter issues but after re-enabling SLI and changing gpumaxbufferedframes = 1 from 0 in gamers profile config file things are working well though I have had one total freeze this morning which is new.

 

The only scenario you would want to do anything with it on matching cards (SLI set up), is if you have a game that has no or a very terrible sli profile that also happens to be a physx game... then you can set the 2nd to be dedicated physx can offload it from the main gpu and usually bumps up the framerate. If the game has none sli profile auto should do that anyway... if it has a terrible sli profile then you can set it yourself instead using sli.