Bought last week, installed today, did not go well at first. Only booted after a few tries, with a single stick in the right slot. After that I re-tested the left slot, and both at once, and it keeps booting fine. I guess the memory controller just needed an easier homework to train on first.
I purchased a Kingston FURY Impack 32GB kit (2x16GB) model number KF556S40IBK2-32 and have not been able to get the system to boot with any combo of single or dual sticks.
Configured my Framework 13 with a Ryzen 5 7640u.
Going out to Microcenter later for a Crucial 32GB stick kit that is on the Framework compatibility list.
At the time (end of September 23, bought before the laptop arrived ;-)), these were the only available 48GB modules here in Germany. More or less a bit overkill as well, but when moving from one machine to the next, the inner nerd in me needs a bigger number in RAM