Industry insider Kopite7kimi has confirmed key specs of the Nvidia GeForce RTX 4080. It will be offered in 12 GB and 16 GB flavours and feature varying CUDA core counts, memory modules and GPUs.
https://www.notebookcheck.net/Nvidia-GeForce-RTX-4080-16-GB-and-12-GB-specifications-confirmed-by-new-leak.651750.0.html
So the 4080 16gb has lower bandwidth than a 3080 10gb?