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Nvidia reveals that 150 RTX A6000 GPUs power the Las Vegas Sphere
(www.techspot.com)
This is a most excellent place for technology news and articles.
The AI numbers are pretty solid. Papers published on Hugging face list training times and platform and convert that into CO2. Those will be full load for weeks/months across arrays of GPUs.
In this case, I don't see why you'd need that kind of hardware for this application. You might be right that it's not running at maximum load. If so, then somebody has been mis-sold the hardware. Whatever you're doing it will be at a consistent load though. They are always doing the same thing.
It's probably that only their professional tier cards are built to handle synchronization on that scale. There are obviously other massive displays out there, but they're also using specialized and expensive hardware to handle all the signal processing.