Crucial SO-DIMM 48GB, DDR5-5600, CL46-45-45, 2RX8
it was at the time I bought the RAM the same amount as the 16GB so I went for the 48GB module 
I bought 2x32GB of the Kingston Fury modules, luckily before the stupid AI-boom caused the prices to go through the roof. Now the RAM is probably worth more than the rest of the laptop combined!