How can I check the NVME specs

Gen4 x4), 1 ; 2 USB Gen2 , 8 USB Gen1 ; Realtek Gigabit LAN *Not compatible with AMD

Looking at Amazon there is PCIe Gen 3 NVME and PCIe Gen 4 NVME for sale I don't see this even mentioned on the Wikipedia page for NVM Express

nvme m2 slot content nvme general ssd form factors graph 3 We show you each step to formatting and erasing an SSD or HDD Trisha pointing at the PCIe Express Gen 4 logo 4:

nvme slot types PCIe Gen 4 is backward compatible, so a PCIe Gen 4 device connected to a PCIe Gen 3 system will function normally at PCIe Gen 3 speeds That means if you