Does anyone have experience with CUDA rendering in Premiere CS6 with the new iMacs? They use an unsupported GTX 675MX 1GB GDDR5 or GTX 680MX 2GB GDDR5, so I ask.

How about MacBookPro i7 GeForce GT 650M 16GB? It's basic 1080p with Fast Blur and Fast CC, with title, so it's not demanding.

Or even Samsung laptop i7-3635QM GT 650M?

I've had good luck with a string of unofficial and official cards, often in very basic Windows machines for several years, but I'm stuck with an ASUS G74 with GTX 560M. Premiere sees CUDA and plays accel. effects nicely (yellow line) -- but renders like SW-only.  Could it be that XDCAM EX is too challenging for the slightly slower processor?

So, anyone have experience rendering with the new iMac?