PCIe x4 vs x16 for single NVMe SSD speed increase?

Booting from drive located on a PCIe Adapter Card m 2 in pcie slot Most of cheap dual adapters provide one slot for PCIe, and one for SATA True dual PCIe cards have x8 connector, for example AOC m24 slot SATA SSDs and SSDs that use two PCI Express lanes tend to use keys B and M to maximize compatibility, since both connectors can deliver both

m2 vs nvme slot Remember, certain mobos only allow you to use either the none GPU PCI-E slots or the chipset