The original Switch has a 2017 model Tegra X1 (model T210) processor from Nvidia with 256 CUDA cores and 256 shader cores. The GPU operates at 700-900 MHz, it has a 64-bit memory interface, 25.6GBps ...
Namely, it identifies the mystery card has having 18,432 CUDA cores and 48GB of GDDR6 memory tied to a 384-bit bus, for 864GB ...