Following is my configuration
MOBO: BT250 Mining Expert
GPU1: Zotac Nvidia 1070ti
GPU2: Zotac Nvidia 1070ti
PSU: Photo 1050
OS:Windows 10

GPUs connected to mobo with PCI Riser cards.

My issue is 2nd GPU is not recognized by Windows OS 10. When I tried to connect individually, both are being recognized.But when connected both together to mobo at once, only one GPU is being detected in the device manager.

I connected my monitor to the hdmi mobo.

Any help is much appreciated, I'm stuck here and no clue found in any of the forums