The iDSD micro supports DSD512 only via ASIO. If using WASAPI or core audio, DSD256 is the maximum since DoP must be used. Mac uses core audio drivers only (Apple deleted ASIO support from their OS with the release of OSX), there is no ASIO support on Mac. Playback software could in theory incorporate it's own ASIO subsystem. This has so far only been done under Linux as far as we know.