https://wccftech.com/amd-rdna-2-sienna-cichlid-gpu-big-navi-21-radeon-rx-graphics-cards-spotted/

A mysterious AMD RDNA 2 GPU has been spotted within the latest Linux patches & it's speculated that this could be the Big Navi GPU powering next-generation Radeon RX graphics cards that all enthusiasts are waiting for. This specific AMD GPU was spotted by the folks at Phoronix and is codenamed Sienna Cichlid.

The Sienna Cichlid codename itself is quite fishy. AMD moved to star naming conventions for its next-generation parts starting Polaris. We got to see Vega which was the last of the GCN GPUs and now we are soon going to get the 2nd update to the RDNA architecture in the form of RDNA 2. The RDNA 2 lineup will consist of several Navi GPUs. While the Star naming conventions for these GPUs aren't changing anytime soon, it looks like, at least internally, they go by a different set of naming schemes as is evident by this leak.