NVMe x4 adapter card for PCIe x1 slot

Which Slot to use? m 2 and nvme slot difference different M2 SATAPCIe disks If I put M2 NVMe disk into top M2D slot, it would run only at x2 speed instead of x4 on AHCI mode (see m2 sata vs nvme slot The main difference between a SATA and NVMe SSD is the interface technology and levels of performance A SATA SSD still uses the SATA-based interface

m2 pcie 40 in 30 slot But no real world benchmarks would show any difference worth anything Just use whatever slot I used M2_2 and my nvme wd sn750 ssd ate up SATA