activate the 2nd GPU

I have my server with NVS 810 connected to eight monitors using a DP to HDMI converter. Because only 4 of 8 screens are displayed and detected on the device manager. These monitors are connected on 1stGPU. People on the 2nd GPU are not visible. My driver is version 440.44 and I am using 6.10finall centos so far.
My screen resolution is 1920 * 1024 with a 60hz refresh rate.
Please help me reactivate the 2nd GPU