Hi Joe, Well the new OS Ventura works great on an M1 Mac like the one I'm responding to you with (Mac mini 2020). Upgraded from Monterey with no issues, everything runs. Just so you are aware I was trying to run OS Ventura on an SSD external drive on my iMac 2017. My local drive has Mojave running on it as I have lots of 32 bit programs I like to have available to me, Up until now I have always been able to run the latest OS on the external drive. This way I have options as I can't run some of the older software on the new OS, and I use the external drive to run the latest software like Adobe CC 2023 photoshop, illustrator, etc.. full suite. I tried to load and use Ventura on the external drive 3 times: twice upgrading from Monterey and the last time from a clean wiped drive to Ventura. No improvement at all, can't run basic programs like mail and safari, Adobe creative cloud crashes and apart from Chrome just made the machine worthless. I'm now convinced I will stick to Monterey until the next OS comes out. I have options, but this wasted a lot of time. I had even considered upgrading the local drive thinking the problem was the external drive, but perhaps our iMac 2017's are not compatible. My external drive is a SABRIENT rocket 4TB thunder thunderbolt 3 (2400 MBs write/read)fastest external drive I could buy and works flawlessly until loading OS Ventura. Good luck I have given up on it with my iMac.