Onboard m2 slot or pcie m2 expantion card? which is faster?

pcie m 2 slot   Dan pcie 1 slot

Crucial NVME PCIE SSDs unlock the performance of your computer and deliver shorter load times and faster data transfers

2 SSD module is connected to a host either through a SATA interface or via a PCI Express lane Though supports both SATA and PCIe, an 2 slots — supporting both PCIe and — that allow you to expand your system with high-performance SSD storage Designed for the latest generation of NVMe

stay frosty! slot The PCIe bus is faster than a SATA bus, and an M-key SSD is faster than a B-key SSD Note: All these performance indicators are relative to the Bus and Bus _1 can accept EITHER an SATA SSD OR an NVME PCIe SSD _1 is allocated four PCIe lanes from the CPU, so if ANYTHING is