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The GTX 460M has 192 cores and as you stated it has 1.5 GB of Video RAM. Those are the two qualifications necessary to run MPE hardware acceleration. Since it is not on the supported list you will have to add it to the Adobe "cuda_supported_cards.txt" file to make it work. Do not forget the "M".
It does have two disk drives as the minimum Adobe system requirements specify which is good There is a predecessor model of this computer (with an i7-740QM processor) scored 372 on our PPBM5 Benchmark which is quite respectable for a stock laptop.and it had the GTX 460M nVidia GPU enabled for Hardware MPE that you asked about. For about $2,000 with a stock model with the new Sandy Bridge CPU at 2.0 GHz it should do appreciably better an is quite a respectable Premiere editing platform.
Thanks Bill for the helpful links, and for catching my slip on the clarification of the "M" for the mobile. I also was looking into this monster from ASUS http://www.xoticpc.com/asus-vx7a1-lamborghini-pre-order-p-3046.html
but I'm torn if I should get the 1.5" (approximately) larger screen from the previous speced model or go for this one because the 460M is more powerful.
In my case I might opt for the larger screen (only for my older eyes) and my personal choice would be for the matte screen, I hate the shiny screens, but then I do not know what graphics card the current model has. But it is a beauty with two disk drives and 16 GB of RAM