PCIEx16 drops to x 8 when M2 SSD is installed???

Using The Best Slot on a Motherboard #short m2 slot pc Sonnet 8x4 Silent Gen4 PCIe Card Installed in x16 PCIe Slot One Slot One Card 64TB of Fast NVMe Storage Front of PC Tower * Only in a 2023 Mac Pro (M2 m2 vs nvme slot Sonnet 8x4 Silent Gen4 PCIe Card Installed in x16 PCIe Slot One Slot One Card 64TB of Fast NVMe Storage Front of PC Tower * Only in a 2023 Mac Pro (M2

m2 pcie 40 in 30 slot I want to install Windows 10 on the fastest slot, but I am unsure which to use When selecting any drive installed on the PC Magician shows the interface