https://wccftech.com/amds-big-navi-gpu-codenamed-sienna-cichlid-will-allegedly-feature-5120-stream-processors/

Komachi_ensaka recently posted a CU count of AMD's upcoming Navi 21 GPU and this is the same count that has been posted by Chiphell leakers and other various twitter leakers so It is definitely starting to look credible. At 80 CUs you are looking at 5120 stream processor and could be the big Navi that gamers have been waiting for almost 3 years now.

Twitter user _rogame also created a compilation of the leaked specifications and this is a great table for reference purposes: