Well I tried using OpenCore to load Ventura on my 6,1 (12-core, D500s), no dice. OpenCore says the unit is supported but I kept getting to the point where after it rebooted about 6 times and it comes to the last boot where it's going to boot Ventura off of the internal (Apple 1 Tb) SSD, it goes to show the first Ventura installation splash-screen and you can see (quickly, don't blink) the Ventura background flash on-screen and you can see the large centered text box, but the text box is empty except for the back button in the lower right, and then it flashes to a black screen, you get the beachball for about 20 seconds and then and issues an error message where the options are retry, ignore or report to Apple. Retry just repeats the whole process, ignore makes it black-screen and reboot. I wiped the internal SSD again and tried it a second time, same result (I spent about 3.5 hours on this today). In the end I just went back to Internet Reload of Monterey. I'll probably spend some more time researching why the OpenCore process failed but my guess is OpenCore support for the wacky video-cards this thing uses caused it problems rendering the opening Ventura screen..(?) I don't know, it just seems that way. Maybe it's because of my video setup? I hooked up a 32-inch LG 4K monitor to the trashcan. Anyway, tonight I'm back on Monterey and everything's working fine. Tempted to just stay on Monterey.. BTW, I'm not a Mac expert by any stretch, but I just did an upgrade to Ventura using OCLP on a MacBook Air 2015, and even though it took a long time, it worked without a problem.. thought it might go as smoothly with my "new" (just bought it off of eBay) Mac Pro 6,1 trashcan. FWIW the guy I bought the trashcan from refurbs Mac equipment and resells it, he seemed pretty knowledgeable - this particular trashcan had the 3 core CPU and he upgraded it to the 12-core CPU but the D500s and the 1Tb Apple SSD were stock. Like I said Monterey runs like a champ, no issues, my only interest in Ventura is in extending the life of the Mac Pro beyond 2024 (and I enjoy the technical challenge: I'm 62 years old, retired from 32 years in IT working for the U.S. Army supporting test and evaluation of weapon systems).