Possible ways to connect two SSD at a time?

My laptop has a gen 3 slot First of all, I know that a PCIe 4 SSD NVMe will be running at gen 3 speeds and bottlenecked by the PCIe 3 slot But

@yesornofei, Thunderbolt 3 bandwidth throughput is capped at 22Gbps PCIe NVMe drives in a TB3 enclosure work but they don't go faster than

will gen 4 nvme work in gen 3 slot Good idea I think the best idea is to get pcie x 4 if building today

willy wonka and the chocolate factory slot machine Q1) will the Gen 3 operate on x16 or will it be x8 or x4 coz, the specs says A top end gen4 graphics card with a 16x connector, if installed in a 4x gen3 slot