How can you know if a PCIe slot is shared with another?

Adapter placement rules and slot priorities for the EMX0 PCIe Gen3 I slot pcie Yes, a x1 card should work in a x16 slot It's good that you've got it to work in a x1 slot What else have you tried it in besides the x16 slot slot paypal Well-known member looking at your image the GPU is not even fully into the slot at all its sat with all the PCI-E Card Edge out the slot

slot owerri Slot Size OS support PCIe LP 8 Gb 2-Port Fibre Channel adapter PCIe Low profile, short AIX, IBM i, Linux 5276 PCIe LP 4 Gb 2-Port Fibre PCIe Channel