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

NVMe SSD 50% slower on socket 1 m 2 ssd motherboard slot
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m2 slot pc GIGABYTE B460M D3H DDR4 Micro ATX Motherboard with Dual Nvme Pcie Gen3 X4 Slots, Alc1200 Audio Design, 4 Display Interfaces Support,Dual Bios