PCI Express x1 in a PCI Slot

Using a PCIe x1 card in a PCIe x16 slot x1 slot Most of these things you mention would be bottlenecked by an x1 slot x1 maxes out at under 1GBs, so you won't see the full benefit of NVMe, x1 pcie slot View Jetson Orin Technical Specifications ; PCIe*, x16 PCIe slot supporting x8 PCIe Gen4 Key M slot with x4 PCIe Gen4 Key E slot with x1 PCIe Gen4, Up to

x1 slot 1 additional PCI-Express x1 slot is needed