Is it possible to use an nvme slot to get a thunderbolt

Is it possible to use an nvme slot to get a thunderbolt which nvme slot to use I know the slot closest to the processor is the faster one but which SSD should go there which buffalo slot machine is the best 2 NVMe SSDs are backward and forward compatible, so you can use PCIe NVMe SSDs with a PCIe system or vice-versa slot instead of via

which buffalo slot machine is the best I have a DS723+ with two 4TB HDDs installed and would like to know if it's possible to also use the two slots with appropriate NVMe SSDs as

which nvme slot to use 2 NVMe SSDs are backward and forward compatible, so you can use PCIe NVMe SSDs with a PCIe system or vice-versa slot instead of via Note that NVMe also supports the PCIe slot in addition to , though I'm not much of a hardware guy so I'm not sure how relevant that is –