Hi guys,
I’m still running El Capitan (aka El Crapitan) on my early 2008 MP. However, at this date I’m on Resolve Studio 14.3 and have experienced no issues with it at all, so far. FYI, Blackmagic specifies macOS 10.12.6 Sierra, but as I say, no problems so far. Your mileage may vary, so approach with caution.
Brent, I’ve seen various methods of updating to Sierra with the MacPro 3.1, but didn’t want to deal with possible issues like having problems with regular OS security updates, etc. Have you encountered the like?
Thanks.