I finally solve the issue: In case of a Asus Prime Z270-A MB, and 8 GPU (vega in my case) I have used both M2 slots without using PCIE X16_1 (the main one).
Now it's working perfect with 8 GPU and Blockchain driver!
Enjoy
I have identically the same situation with you but without a solution yet. i haven't see also the compute mode in the latest driver for vega...
Hi, everytime I uninstalled , I uninstalled the drivers using DDU.
I think it's some driver related problem , since with the newest it works and with blockchain drivers it doesnt.
Regarding compute mode I haven't seen compute mode for vega in the latest driver.
Did they enable it ?