I currently have a GTX 275. Now, because of Directx 11, and because i need a new card, will i be able to use PhysX and Cuda if I upgrade to the HD 6950, while still keeping the GTX 275 installed on my motherboard. Will there be driver errors between ATi and NVidia? Will i be able to utilize all displays connected to both (i.e. use the HDTV output in the GTX 275 and use the DVI output on the HD 6950)? and will PhysX/Cuda run fine on this setup. If you must know, my resolution is 1920x1080, i plan to flash the 6950 to a 6970, Cuda will be used for converting movies, my PSU is 1kw, and PhysX for games.
Overall, the graphics frame rate performance has the AMD Radeon HD 6970 matched nicely to the GeForce GTX 570. Measured at stock (reference) speeds in ten different tests, the Radeon HD 6970 was either slightly ahead in half of them or deeply trailed in the other half. We've excluded HAWX 2 from this review, until AMD drivers can compensate for the performance skew. The DirectX 10 tests seemed to really score the GeForce GTX 570 way ahead, while many of the DirectX 11 tests pulled the Radeon HD 6970 ahead by a few FPS:
^Nothing happens. It just works. Nvidia specifically has a code that disables PhysX on their GPUs if ATI is present, this patch is just a work around. You're still running off the NV drivers.
If a new version of PhysX needs to be installed you simply have to rerun the GenL patch. It's simple - install NV drivers, install PhysX, run patch, reboot and enjoy. Same process as new drivers are released. I've run v1.04ff since Nvidia updated from their 196 to 258 driver series - so for months - without the slightest issues.
CUDA should work fine. I don't know first hand but in GPUZ it is checked as being active, and I'm pretty sure it has to work by default if PhysX is working.