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

Expansion Card Watch Before You Buy m2 expansion slot PCIe expansion card adapter or a multi NVMe SSD PCIe expansion What are PCIe x1 m2 slot mainboard 2 NVMe PCIe x4 SSD Adapter for PCIe x16 Expansion Slot, accommodating four NVMe SSDs in a compact space with transfer speeds up to 64Gbps per drive

m2 expansion slot 2 NVMe all available SATA ports and a PCIe SATA expansion card? As Laurence stated, the slot is PCIe2 x2 and it is M slot keyed