PCIe incompatible card?

Hey folks,

I have a T1000 machine wich has an PCIe slot. If I put a TV (PCIe x1)
card in that slot, it is recognized by firmware:

/pci@780: Device 0 video

Physically the slot looks like at least x8. So I put in a NVME card, and
it is simply ignored:

Device: pci 
/pci@780: Device 0 Nothing there
/pci@7c0: Device 0 pci 
/pci@7c0/pci@0: Device 4 network network 
/pci@7c0/pci@0: Device 8 pci 
/pci@7c0/pci@0/pci@8: Device 1 network network 
/pci@7c0/pci@0/pci@8: Device 2 scsi tape disk 


Am I missing something and it just can not work?

Martin