Hello
I’m using Audirvana Studio 3.01 with GentooPlayer in RAMsystem mode, and GentooPlayer is only using 15% of the buffer RAM. What would be the optimal buffer RAM value for streaming Qobuz, Tidal, radio, and my local library ?
There is no optimal value. I have a Pi4 with 4Gb internal memory and the Audirvana max memory setting is 2500Mb. You can use way less before it becomes a problem, I’ve tried. I’ve just left it at 2500 Mb since the single use for the Pi is running Audirvana.
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The optimal playback preload memory allocation, is the one that delivers the most transparent playback sound-quality and operational stability.
That’s why I’m asking for the optimal RAM allocation. Currently, I have 8.3 GB, which, in addition to the RAM used by GentooPlayer, represents 14% of my 30.9 GB of RAM.
What @Agoldnear is saying is that you should try to figure out where the sweet spot is for your set up.
I have set 3.3 Gb buffersize out of a maximum of 7.7 Gb (Linux Core Player) and it plays wonderfully. But that may differ from your specific situation. The more the better is not the way to go. Your device needs headroom as well. That’s (maybe I’m misreading) also what @jmtennapel is implying.
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Basically depends a lot on resolution of files and the amount of DSP you apply. I use a Mac and have observed RAM use in AS playing various resolution files.
16/44.1 up to 24/192 with long classical pieces then 2GB is enough. If you upsample to 768 kHz with Audirvana then 6 GB is enough. Use a lot of DSP then higher values may be required. This applies to 2 ch output. Obviously multiple-channel output would be higher I would think, I only have 2ch files.
It only really becomes an issue on systems with low RAM amounts. Key is to have enough set in AS to manage your file and DSP demands to load a full track without using too much that would result in your OS being starved of RAM.
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… Among other computer platform topologies/OS operational related resources and capabilities… 
This is correct…
Nobody but you can determine the point of diminishing returns in your playback performance and playback sound-quality, given all of the potential variables in your playback scenario,