Is the new iMac really faster for video coding?

I recently bought the new Imac 27 inches, 3.2 GHz. I mainly need this speed to edit and to code my bluray movies from African safaries journeys
Until last year use an 2008 iMac. Editing was fine but coding was very long (up to 6 hours for 40' with the best performace parameters und 2 passes)- I use Adobe Première.
With my new Imac editing is more convenient but coding ist not much shorter (up to 5 hours 30' for 40' with the same parameters). I was exepecting a much shorter coding time.What the purpose of nice marketing specs like high speed und turbo boost if they cannot really be applied in specific applications like video coding.
Or am I mistaken?
Regards
Patrice

Hi Patrice,
Within Apple’s slim new 21.5- and 27-inch iMacs are NVIDIA GeForce GPUs, based on our new Kepler-class architecture, which helps make them up to 60 percent faster than last year’s models. This follows news in June that Apple’s 15-inch MacBook Pro with Retina display uses Kepler GeForce GPUs.
The new 27-inch iMac offers the GeForce GTX 660M as its base GPU, with even faster GeForce GTX 675MX or GeForce GTX 680MX GPUs available. The 21.5-inch model comes with the GeForce GT 640M GPU, with an available upgrade to the GeForce GT 650M GPU.
http://blogs.nvidia.com/2012/10/big-imac-news-less-heft-more-kepler/
So, any Apps that use the GPU to assist GPU should be much faster.
Though I don't see it listed here, it may be too new, I suspect it may be supported...
http://www.adobe.com/products/premiere/tech-specs.html

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Hi Patrice,
Within Apple’s slim new 21.5- and 27-inch iMacs are NVIDIA GeForce GPUs, based on our new Kepler-class architecture, which helps make them up to 60 percent faster than last year’s models. This follows news in June that Apple’s 15-inch MacBook Pro with Retina display uses Kepler GeForce GPUs.
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http://blogs.nvidia.com/2012/10/big-imac-news-less-heft-more-kepler/
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http://www.adobe.com/products/premiere/tech-specs.html

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Is the new iMac really faster for video coding?

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