Need an extra M2 SSD but cannot fir it? Well, Silverstone released "ECM21-E" that converts your PCI-Express 4.0 compatible M.2 SSD to PCI-Express x4 slot compatible.... Silverstone ECM21-E Screwless design M.2 PCIe/NVMe SSD to PCIe x4 adapter card
I wonder if the classic 3.0 adapter cards will work on the 4.0 PCIe bus with 4.0 NVMe, it should no? I mean it is just a socket converter...
i would said "yes", but it depend on what is on the board, cheap one just convert, and some have a chip on it... so i don't know.