Gtx 680 + 550 ti Dedicated PhysX?

[xxdms2k11xx]

should I use 550 ti as Dedicated PhysX?

 

[manofchalk]

If you already have it, why not.
The only real reason for a dedicated PhysX card IMO is that you already have a card not doing anything.

 

[TopLuca]

Not really what I'd do as the 680 is strong enough that it can do its own physX , most often than not when using a weaker card with a stronger card you'll see less performance not more.

Video Proof * little bit older vid but still same concept : https://www.youtube.com/watch?v=cbww3dhzK0M

I think you shouldn't do it as you'll get less performance .

 

[17seconds]

How much difference does a dedicated PhysX card make?
http://www.volnapc.com/all-posts/how-much-difference-does-a-dedicated-physx-card-make