Looking through the specs on ark.intel.com, the Thunderbolt controllers that specify PCIe lane counts say at best they support one x4 or four x1 links, so any e

Looking through the specs on ark.intel.com, the Thunderbolt controllers that specify PCIe lane counts say at best they support one x4 or four x1 links, so any eGPU enclosure using those would need to connect the Thunderbolt controller to a large and expensive PCIe packet switch in order to provide more than four lanes of any speed to a GPU.