Hi @felince, not sure if you bought the 970 evo, but I’m planning on buying it. What you can do is place the 970 evo in the secondary M.2 slot, migrate the partitions from your primary SSD (so also the OS) to the 970 evo and then swapping them from slot. This way you have the larger SSD in the primary x4 slot and the original smaller SSD in the secondary x2 slot 😉
Hope this helps, I know I’m a little late to the party 😀
Xiaomi Notebook Pro 2018 i5 8250U MX150