I was wondering if anybody had any info about using a dedicated physx card with a gtx 470. I upgraded from a 8800 gt sli setup to the the evga 470 and was trying to set up one of the 8800's as a physx card. with the official drivers I cant change what to run physx on the 8800 shows up in device manager as not working correctly becouse of the fermi drivers. when i experimented around a bit with other drivers that support the 8800 gt i can dedicate it to the 8800 but it seems to destroy my performance in physx games does any body know if it really is worth it to run a dedicated physx card with a 400 series or do u think its just a driver issue at the moment ??? 

I ran a GTS250 with my 470, no issues with the .41 drivers.
Uninstall the drivers, restart, let windows install the generic drivers, restart and install the .41 driver.

As far as performance goes, a 96sp card is the lowest I would go for a PPU.
The 470 does good on its own, my GTS250 gave it a slight boost in physx performance.
So IMO an 8800GT might not be of any benefit.

oops I was thinking it had 96.