There are some mistakes: https://opencore.slowgeek.com/?file=sandybridge0666qXocF&rs=sandybridge066
I have not done power management yet. Try to configure according to the instruction: https://dortania.github.io/OpenCore-Post-Install/universal/pm.html#sandy-and-ivy-bridge-power-management
My currently version OC is 0.6.6. There is probably no difference between Sandy and Ivy. The installation instructions are the same: https://dortania.github.io/OpenCore-Install-Guide/config-HEDT/ivy-bridge-e.html
I attached the archive to the first post. The archive does not have information about the serial number of the device. You need to generate it yourself: https://dortania.github.io/OpenCore-Install-Guide/config-HEDT/ivy-bridge-e.html#platforminfo
A note to the forgetful one:
I used the instructions for Sandy Bridge-E, since there are significant differences from Sandy Bridge
Gathering files are also different from Sandy Bridge
I completely went through all the instructions myself, collected the config and files, but I had a black...
The interface is definitely better than Catalina and previous versions. I can't say anything about performance, but it's interesting to compare. Attached screenshots from Geekbench 5, can be compared with your tests - we have the same hardware.