Why would the specially binned Nano chips stay in stock so much better than the regular binned Fury X chips?
Or is it too early to wonder about that?
Probably because it fails at it's advertised goals.
It claims 175W TDP when it actuality its a 215W card at stock settings. In comparison the GTX 980 claims 175W TDP and in actuality is a 170-180W card.
Secondly it's only about 2-4% faster than a stock GTX 980, but consumes 23% more power.
Thirdly it doesn't really fit HTPCs since it's really too loud. It's louder than the NVTTM cooler, which IMO is already too loud for a silent build. The Nano needs a larger heatsink so it can get away with a quieter fan curve.
IMO a fully unlocked air cooled Fiji with 275W TDP would be more interesting.
Basically it works for 1 build: a SFF case that for some reason can't fit a reference 10.1 inch GTX 980 (pretty unusual. Most SFF cases that can't handle a reference 980 also can't handle the R9 Nano). You don't care about noise or power, but you want the performance of a GTX 980.