Umm… No? (re: most things you’ve said there)
As long as you’re able to run multiple GPUs simultaneously (I’ve done it in both Win and Lin), or figure out a pass-through like they did to the mobo output, you don’t -need- the output on a second graphics card (hence why I asked about running one headless.
Rack “not particularly demanding”? I don’t know what rig you’re running or what rock you’ve been living under (maybe you’ve not been on the official FB group?), but when a good number of users struggle with stuttering audio, it’s demanding enough.
@vortico has also said elsewhere on the forum here that he only looks for VSync, not a specific FPS, so unless I misunderstood, your (@skrylar) claim is spurious.
On top of that, I can swear it’s been mentioned before (and could be backed up by Resource Monitor or Taskman) that the GPU is invoked by Rack to help run what is essentially analog emulation.
In the end, I’m just curious whether Rack could benefit from offloading some of the calcs to a relatively budget-friendly powerful GPU, in a manner similar to what they did there…