even with nvidia nvlink are now exclusive to RTX 3090 only. in short both AMD and nvidia no longer officially support multi GPU. right now it is 100% up to game developer to do it. but the problem is not even one developer interested to implement multi GPU in their game.
thanks for your answer I will go singel card then,In my 40 years of gaming I have had one amd pc ,always Nvidia.but now it is maybe the time to try AMD again will probably wait and see the real world tests and overclocks