Ubuntu 20 doesn't recognize second GPU

Hi everybody. I am working with Ubuntu 20.04 that it has installed 2 GPUs of the same type: NVIDIA TU102 [Geforce RTX 2080 Ti Rev.A]

But Ubuntu only recognize one GPU:

Device-1: NVIDIA TU102 [Geforce RTX 2080 Ti Rev.A]
vendor: ASUSTek
driver: nouveau
v: kernel
bus ID: 01.00.0

We want to work using SLI with 2 GPU. I installed a brigde between GPU. I tried to install drivers (by sudo) but Ubuntu didnt install it showing error “this device has noveau”

I am new in this area and I have consulting in many forums but I havent found the solution.

Thanks a lot for you helping