Which PCIe slot is to be used

I am trying to get OPNSense 7_1-amd64 running on a HP Thin Client T610 with 4GB RAM I have added another intel ethernet on the PCIe slot,

PCIe x16 slot for video, a gaming system needs a more advanced mother- board Thin client 4 What are some of the elements of a home A CADCAM

5 wishes slot I'm planning to use a 'Thin Client' to build my own router The computer has what I think is a PCIe x16 slot and I have a PCIe x4 4-port

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