David_172 :
It makes a difference in quite a few games with my 1080 dedicated to physx, however those are 3 1080s.
So you have 3 1080s in another rig and you have one dedicated for PhysX?
I'm trying to make 2 points:
1) There's very questionable benefits of Tri SLI over 2 card SLI... so getting a 3rd 980 doesn't make much sense on as a Tri SLI solution
2) PhysX just doesn't push high end card very hard. So using something like a 980 (or !!1080!!) as a dedicated PhysX card is complete overkill. If it's running as a dedicated PhysX card it's not contributing at all to the visual rendering of the game, it's just handling PhysX, and I think you'd find something like a 980 would be running at 10-30% utilisation with a PhysX load. In other words you could get all the benefits of a dedicated PhysX card from a much cheaper GPU like a 750ti or 950.
It seems like a dedicated PhysX card can provide
some small (but measurable) benefits in
some PhysX games. So if you play a lot of PhysX games and have money to burn, you could see some of those benefits from a dedicated 750ti or 950.
One more caveat I didn't mention above, you need at least x8 PCIe lanes for both of your SLI cards (x8 lanes is an Nvidia requirement for enabling SLI). So you need to make sure your motherboard has a PCIe slot for the 3rd PhysX card (it'll run on x4 lanes just fine), but will still give you two slots with x8 remaining. Lots of motherboards will do SLI with 2x8 slots, but adding a third PCIe card will drop the second slot to x4 lanes... meaning you won't be able to enable SLI.
Post your motherboard if you're unsure.
I still question whether it's worthwhile myself, though it's certainly an option as long as you have the board to support it.
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