How to run external PCI-E x1 card with laptop?

XPS 8700, bottom slot is wired only for PCIe x1, NOT PCIe x4 x1 pcie slot Install a PCI Express x16 Card into a PCI Express x1 slot, in a 1U chassis · Designed to fit most 1U server chassis' · Complete pass through design supports the x16 slot Install a low profile video card into a system with only a x1 PCIe slot • Install x4 or larger PCIe cards into a system with only x1 PCIe slots available

x16pciexp slot The spec for X1 PCI-e states that the max is 25W I would think that the cards intended for an X1 slot should conform to that standard YMMV of