There's always been a fairly noticeable difference between the way Premiere Pro performs on a system with a CUDA video card vs. Open CL thanks to the hardware acceleration CUDA owners receive over the basic software-only Open-CL gets. Even with the recent additions of the Macbook Pro GPUs to the hardware acceleration, the balance of power is still very much in the direction of Nvidia and CUDA. But the difference in performance between CUDA and Open CL with the ray tracing feature in After Effects is night and day different. Hours vs. days in terms of render time!
Stu over at Prolost has a great write-up about this and really, in a sense, lets Adobe have it over this disparity. As always, its a great post and the comments are just as interesting as well. Please check it out.
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