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Is Thunderbolt 3 (for eGPUs) an option? Couldn't find any info on that..

We support USB4 on all four ports. We can't state anything about Thunderbolt compatibility until we complete certifications around it.

Are the expansion cards based on USB, or is it more like Thunderbolt, built on top of PCIe?

The lack of Thunderbolt makes it a complete no-go right now.