YouTuber Geekerwan measured the chip and says it has a die area of around 496mm². This makes it 26.5 percent bigger than the GA104. It's an 8nm Ampere-based chip with 7680 CUDA cores and a 256-bit memory bus.
This week NVIDIA formally introduced its GeForce RTX 3080 Ti Laptop GPU featuring GA103S/GA103M GPU labeled as GN20-E8-A1 for this mobile graphics card. This is not the full implementation of the GA103 GPU though, as the rumored specs mentioned up to 7680 CUDA cores, whereas the mobile 3080 Ti comes with 7424 cores.