PCIe gen 4 drive in a gen 3 slot?

Hi, I have a 2018 Mac mini and a Thunderbolt3 NVME SSD enclosure, I notice that the Gen 4 NVME SSD is getting cheaper and cheaper,

Comments40 ; Samsung 980 Pro NVMe SSD Worth It?

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genting slot game Crucial T705 PCIe Gen 5 NVME SSD, 14,500 MB 2 slots where at least one supports PCIe, it's worth considering your secondary slot for an SSD upgrade