@jiffyslot
I normally use an HDMI -> HDMI cable with my Gigabyte Z390 Designare, i9-9900K, RX 580, F9i, CSM - Disabled, iMac19,1, OC 0.9.2, Ventura 13.4. However, I used the EFI you provided for a MacPro7,1 and entered new serial number, etc. I used a DisplayPort cable (I believe one supplied...