Question on CrossfireX on P45- does it have this capability?

[Comdrpopnfresh]

I just ordered a P45 motherboard that supports ATI's CrossfireX. I am moving all my internals of my current desktop onto the new board- this includes a 4870-1GB graphics card. My question is this: With CrossfireX, can a less capable card be paired with a performance card in such a way that 2D/low power usage will utilize the less capable card only, and leave the performance card idle/off?
I know hybrid crossfire implements a similar feature, but I'd like to know if CrossfireX can do this too- I'd be great if I could plop a 4830 in my system and only have that consuming power and generating heat when I'm not gaming or folding.

 

[SunnyD]

They kinda sorta got rid of that functionality. Hybrid Crossfire is pretty much only a feature of AMD IGPs paired with a 4350.