Caporegime
I haven't tested the Asus ITX one but I have seen it did 3800 on at least 3 dies, Samsung B-die (obviously), Hynix C-Die and Micron 3rd gen die.
The TUF Gaming memory which I got(the 3200MHZ one) is single ranked just looking through the packaging,so it could be Hynix or Samsung methinks.