Types of PCIe Slots PCle Lanes

pcie x4 in x16 slot   Dan pcie 4 in pcie 3 slot

If it's a motherboard slot you're talking about it means it's a x16 physical slot but there are only x4 electrical connections, meaning that

View Jetson Orin Technical Specifications ; CSI Camera, 16-lane MIPI CSI-2 connector ; PCIe*, x16 PCIe slot supporting x8 PCIe Gen4 Key M slot with x4 PCIe Pci express x16 vs x8 vs x4

fortune tiger slot demo PCIe x16 slot with faster bandwidth and lower impedance 2 PCIe Slot PCIe x4 slot with Lower impedance  Next Generation Storage：1*PCIe x4 and 2*PCIe x4 Connectors EZ-Latch：PCIe x16 Slot & Connectors with Quick Release & Screwless Design