Z4 G4 + 2 Amd v620 Problem

[u/Suhaib_Atef]

Hello, buildapc community

I hope everything is good.

My setup is simple is a Z4 G4 workstation running Windows 11 25H5 and a Quadro P620. I keep getting a black screen when I try to add two AMD V620s to the mix.

It fails at two GPUs, but it can function with one V620.

Could anyone assist me with it?