PRECISION T7960 4GPU NVIDIA RTX 6000 ADA problem

Hi all,

I need help , i have PRECISION T7960

config :

8x 128GB

4x4TB SSD

CPU Intel Xeon W9-3495X 

PSU 2200W

4x NVIDIA RTX 6000 ADA

Problem is when is 4 GPU inside I don't have picture in any DisplayPort i add cable ,but when i add just two GPU I have picture.

Has anyone had these problems, if so I would like to be helped, thank you very much.