By the way, when I run the "create emitters from lights" script, Poser always ask me to locate the ball.pzz or else prop located in the folder :Runtime:libraries:Props:Primitives. So I always have to manually locate it. Why ?

I suspect your primitives folder has been moved.  Edit "Poser Pro 2012RuntimePythonposerScriptsScriptsMenuOctaneRender for PoserCreate Emitters From Lights.py" and put the full path into the lines that read:

poser.Scene().LoadLibraryProp("/Runtime/Libraries/Props/Primitives/Ball.ppz")

If I run a Fermi + a Kepler card, will the texture limitations increase or will be still limited by the Fermi card ?

It's recommended to not mix 500 and 600 series cards.  And as Wim says, the 600 series is the way to go.

Creator of PoserPhysics
Creator of OctaneRender for Poser
Blog
Facebook