This gets complicated and would depend on what you want to do with your machine. If you want to be using CUDA for number crunching while you watch films then this might be a good idea, but otherwise using CUDA and say surfing the web don’t significantly effect each other. There is an issue if your kernel takes longer than the screen refresh delay then things can get hairy but if you write good CUDA code this won’t happen anyway. At the end of the day a cheep NVIDIA card would do the job and a 285 would be wasted. That said if you go for a 285GTX or similar in addition to the 480 then you will always have the multiGPU CUDA programming option… again depends on what you want to do with it.
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