Combining Physx with DirectX11

I have been googling it, but i wanted to hear your opinions of what the best way of combining the two are. i have 2 questions:

1)Is it legit and safe to buy two separet cards , a Radeon 5000 series and a dedicated physx card , or will the auto-disabling of the nvida physx card cause problems? Also this is ONLY possible with windows 7 right?

2)I have vista and a radeon 4870x2, is there a way i can enable physx on my rig at this current setup?

thx

xp and windows 7; since you want DX11...well, Windows 7 is the only way to go.

Vista is hardcoded differently and so you cannot install two different graphic drivers at the same time.

it's completely safe if you know what you're doing (basically sufficient PSU and decent cooling solution).

as for legit...well, if you just cannot bring yourself to use a little hack program...no.

not true but the problem is thaq the legit way atm is expensive only the most primo boards support lucid hydra which is designed for this very function but its not a very high yield in preformance as opposed to crossfire/sli

what i mean by the above is say a gtx 275 co-op edition (has a gts 250 core inside which does the physix work) with say an hd 5830 is considered a legit way to do it but atm only 3 boards support lucid all(asus r.o.g. crosshair IV formula, gigabyte-EX58-EXTREME, msi big bang) of which arent ment for those who cut corners on their system. and regular hydra doesnt allow room for physix support

edit: actually i think foxconn's flamingblade may also support lucid but i cant proove this srry

You can't do it with recent Nvidia drivers...DanielDust

currently I have 5870 + 8800GTS setup; forceware driver 197.45.

as for the "legit" way mentioned above -- the early benchie is quite ugly for the bybrid solution; it's still in experiement stage I'd say.

Check out my YouTube videos on ATI+Nvidia PhysX

http://www.youtube.com/watch?v=EF1QZsAwAOk

http://www.youtube.com/watch?v=3ucnR6TVbpo