3rd GPU for physX?

So this hadn't occurred to me, but I just read a post where someone was using one newish/modern video card as their main video card, and then just had another older video card assigned for physx.

I have 2 GTX 460's in SLI right now, but there is room for a 3rd card... if I put it in, I could run my 2 main cards at x16, and this 3rd card at x1. Is the x1 link enough for physx?

I have a spare 8800 GTX I could throw in there... anyone know if there are any downsides to doing so? Will this work at a x1 link?

I remember reading a thread about this a few weeks back, but I couldn't locate it. Basically, adding a card, specifically for Physx, did not increase performance and actually hurt it in some games. So, purely performance wise, there does not seem to be a difference. I'm not sure if it enables extra features in the game, such as increased physics.

I would not run that card in a 1x slot, though. That is not enough bandwidth, I think.

hmm, I could run it at x8, but then my 2nd SLI card would also be running at x8...

I'll just not do this then, if it doesn't actually help anything

Thanks

You have plenty of horsepower already to run PhysX. Dont bother.