macOS BigSur 11.6

Model Name:	iMac
  Model Identifier:	iMac19,1
  Processor Name:	8-Core Intel Core i9
  Processor Speed:	3,6 GHz
  Number of Processors:	1
  Total Number of Cores:	8
  L2 Cache (per Core):	256 KB
  L3 Cache:	16 MB
  Hyper-Threading Technology:	Enabled
  Memory:	64 GB
  System Firmware Version:	1554.120.15.0.0
 
Grafickarte: NVIDIA GeForce GTX 770

Motherboard:  Gigabyte Z390 AORUS PRO ATX 

Bootloader OpenCore 071