I hope you don’t mind me contacting you, but I am having difficulty getting DSD512 playback in my setup and I was hoping you could help. You seem to be having success with a setup very similar to mine. I am also using the NAA app via microRendu, Holo Audio DAC and a PC (i7-7700K, Nvidia GTX1070). However, when I attempt to output DSD512 - the song plays back, but the speed is too slow. For example, it takes 1 minute to play about 56 seconds of the song. I’ve tried using both DOP and Native playback.
If you could share your settings in HQPlayer, microRendu, Roon and any relevant settings elsewhere, I would greatly appreciate it.