I finally installed Catalina and ... wow ... everything went right on the first try !!! I would like to thank you all and in particular
@djlild7hina and
@izo1 for your support.
now I am trying to tune the beast and here the doubts begin again...
1) my PCIe devices are
SLOT 1 Radeon VII
SLOT 2 Titan Ridge
SLOT 3 HighPoint RocketRAID 2840A controller (16xSATA max)
SLOT 4 WiFi/BT card
SLOT 5 HighPoint 7101A-1 4 x NVMe controller
SLOT 6 2 x USB 3.0 card (the only one present on the motherboard I used to connect a USB hub ...)
TB was flashed ad now I have to edit DROM
HighPoint card in SLOT 5 is a 16x controller, but the system sees it as 8x. Moreover, the RAID I installed (2 x Sabrent Rocket Q 4TB = 8TB) works much slower than expected. Is there something that I have to do with OpenCore settings? Or with BIOS settings?
More generally, I still have difficulty understanding how to set the right values for "DeviceProperties" for my specific hack. About this, I read a few times the Dortania guide and the Acidanthera PDF too, but the "DeviceProperties" section seems to be related only to iGPUs and to audio settings ...
2) my system NVMe SSDs (2 x Sabrent Rocket 1TB each one) are placed in M2_1 (macOS) and M2_2 (Windows 10)
M2_1 slot turned out to be the fastest one. I tried to clone the Catalina SSD to one SSD on the HighPoint NVMe RAID controller. It worked fine, but it was much slower than the same SSD put in M2_1 slot and so I reverse to 1st solution. Frankly I don't know how to interpret these differences in performance, considering my mobo has 48 lines ...