plus this from the Octane forums/…
What hardware and macOS versions are supported in PR1:
For PR1, we are supporting AMD Vega and Navi GPUs on macOS 10.15.6. We need 10.15.6 to support out of core memory, there wasn’t much point in releasing without it, so that was part of why we wanted to wait until it was out last week.
Intel and other GPUs will be coming in a future update for macOS 11. We will be keeping the closed beta group going to test macOS 11 builds on Intel and other GPUs.
seems like a Herculean effort from the OTOY and Apple graphics engineering teams.
an interesting thread if anyone cares to read it…