Just got my first H110 and am trying to build my rig out, BIOS upgraded to 1.6.0 Linux HiveOS, it only detects 1 GPU in the PCI_2 slot (long one). Building it out with 2 3070’s to start. If I switch which card is plugged in to the main slot it detects it fine, but not the other. So I believe my riser/cable is fine, since whichever one I plug into the main slot it detects. Tried GEN2 and then changing to AUTO. The bios shows 2 red bars to whichever 2 PCIE I am plugged into.
1 GPU plugged into the long one, the other is plugged into the one closest to the CPU(have tried others)