I have 40GB ram in my T480s, but it is single-channel.
I have also put a NVMe in the WWAN-port, I found out that the Transcend MTE452T (TS512GMTE452T) has the right M.2-port (B+M), and it is a compatible NVMe-drive and not a SATA-drive which some of the disks of that form factor is.
Thanks for the info, I'll have a look. Transcend is weird in a good way, over the years I have bought some hard to find config drives from them, like 512gb msata 5 or so years ago.
I have also put a NVMe in the WWAN-port, I found out that the Transcend MTE452T (TS512GMTE452T) has the right M.2-port (B+M), and it is a compatible NVMe-drive and not a SATA-drive which some of the disks of that form factor is.