A x1 PCIe card can be detected in pcie x16 slot?

M12 x 16 T-Slot Nut RR Brand 16 slot 16-Slot OpenVPX Development Chassis with customizable backplane & IO supports multiple configurations for radar, EW or image processing applications 168 slot gacor Slot Width Effect So = , = = 0 Z = 16 , SW = in , in , in 19 Slot

1688 slot 16x is physical slot size, that is capable of wiring up to 16 PCIe lanes, but on your motherboard that slot has only 4 lanes connected to it