[quote][quote]I'd say get a Nvidia GT200 Series Card to work as a PhysX PPU as well as 2 extra ports for monitors.
I thought that Nvidia disabled support for PhysX while you have a ATI card, didn't they? Also, since I would have 2 cards crossfired, would adding another card actually "play nice" with my current cards? The reason I am asking is back in the day (before SLI and Crossfire were around) if you had 2 video cards on the system, essentially one would take over. They wouldn't work in tandem. In fact, I thought that was the case when you had 2 cards that weren't crossfired. In that case, doesn't the PC simply rely on the primary gpu? You might have to break it down a bit more for me, since (like I said) in my original most, I'm pretty noobish to the whole multiple-gpu thing. :?
First, only games that support multiple card setups will benefit from multiple cards. any other game will in fact only use one card. Unless another card is dedicated to Physx.
Second, to my knowledge, Nvidia has disabled the use of their cards with ATI cards, but with modified drivers, you can solve the issue. Check out:
http://www.ngohq.com/graphic-cards/16223-nvidia-disables-physx-when-ati-card-is-present-78.html
Third, SLI has been around for a very very long time. 3DFX introduced SLI on their Voodoo chipsets for the arcade, and then to the personal computer mark with their Voodoo 2 line of cards. 3Dfx was the father of Scan-Line Interleave (SLI)
http://en.wikipedia.org/wiki/Voodoo2
Hope that helps.
-Tanshin
Edit: Here is another link on getting a dedicated Physx card going.
http://physxinfo.com/news/568/ati-hd-5870-nv-gt220-physx-benchmarks/
Also you can only use two sets of proprietary drivers in Win7 or Xp. (Nvidia and ATI drivers side by side) Take into consideration that xp is only dx9.
So if you want dx10 Win7 is the way to go. I use old 1.81 or 1.85 I cannot remember right now but it is a huge difference between hardware and software rendering for PhysX.
Games like Cryostasis or mass effect even Dark Void play nicely.
Just install both sets of drivers disable the ATI card or just disable the monitors plugged into it. (You have to have another monitor or to switch plugs on your one monitor a few times)
Make the Nvidia monitor primary.
Then enable PhysX in the Nvidia control panel. Leave everything else the way it is and re enable the ATI display. (or displays)
Make the ATI display Primary again.
Then you can run this test to see if you are running Hardware or Software PhysX. http://www.ozone3d.net/benchmarks/physx-fluidmark/
Should be Hardware PhysX then ! :rockout