what does this function give? --print-devices parameter
prints all devices that wildrig can initialize, using the same order as will be used while mining. This is for debug purpose and in case if you want to configure everything(specific intensities/etc.) before start the miner
@andrucrypt, have you benchmarked with R9 nano?
Nope, have no such devices. Anyway, they are too old, and too "hungry" as I know when algorithm needs compute power rather than memory bandwidth.