XBMC requires so little in terms of processing power to drive its interface. As I said previously, the grunt of the work in terms of decoding video is done by the GPU itself so is not dependant on processor. The low end NUC is a dual core Celeron which is plenty powerful to drive the XBMC interface even with a very large media library (I have ~1200 movies and ~150 TV shows with multiple seasons in each) and the NUC doesn't break a sweat.
The only thing to worry about in the future really is h.265/x265 as I don't know if the onboard GPU will be able to decode this format. Saying that, it may be able to do it in software, who knows? I still think it is a good couple years to go before the format really takes hold and replaces h264 though.
edit: everything I am reading suggests that h.265 is decodable within DXVA 2.0. The only thing this NUC won't do is 4K as it is HDMI 1.4a which restricts it to 1080p/60hz. HDMI 2.0 will be needed for 4K/60hz.
The only thing to worry about in the future really is h.265/x265 as I don't know if the onboard GPU will be able to decode this format. Saying that, it may be able to do it in software, who knows? I still think it is a good couple years to go before the format really takes hold and replaces h264 though.
edit: everything I am reading suggests that h.265 is decodable within DXVA 2.0. The only thing this NUC won't do is 4K as it is HDMI 1.4a which restricts it to 1080p/60hz. HDMI 2.0 will be needed for 4K/60hz.
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