Question Triple 4k monitors

Dec 18, 2022
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Good evening,
I recently build a computer for a friend that is simracing.
I7 13700k
Asus TUF RTX3090
32gb DDR5
Etc.
Once done I went to his house to plug this beast on his brand new simrig.
I did spent all the afternoon trying to activate the 3 screens he bought. Samsung Neo G7 32" 4k.
The computer detect the 3 screens. They all work. GPU drivers are up to date, but I'm not able to activate the 3 monitors in the same time. Going in nvidia control panel. And I can only check 2 of the 3 boxes. In Windows display settings I seen the 3 monitors but one is grey and small when the 2 others are working.
Any one of you got an idea to help me?
Thank you in advance.
Cheers