OK so I was curious about this and happen to have a cheap little ASUS T100 running Win8.1, so I decided to try loading Sonar on it. The T100 is sort of a cross between a tablet and a netbook as it has a 10" touchscreen but comes with a detachable keyboard. It has an Atom Z3740 @1.33 GHz and 2 GB of RAM.
The result is that it works, but you really (!) need to pick your synths/FX carefully and don't expect very low latency. For instance with z3ta+, I needed to lower z3ta+'s quality level setting a bit to keep from getting dropouts or the audio engine shutting down, but the Lounge Lizard EP that comes with Sonar seemed to be fine running through a couple of the Sonitus plugs.