GPUs no detected

Hi, we suffer a problem about GeForce RTX 2080 Ti, we have 4 of this model plugged on a Supermicro X11DPG-OT with Ubuntu 20.04.3 LTS, we installed the driver version 495.29.05 and CUDA v. 11.5. 2 of them there are not detected, however, after remove all the cards and plugged only the two cards failed…
Thanks in advanced.

Moved to the forum CUDA Setup and Installation