According to Chinese site ITHome, the Kirin 980 will integrate a quad ARM Cortex-A77 core cluster clocked at 2.8 GHz and one ARM Cortex-A55 core cluster. The GPU will be developed by HiSilicon and it is said to be 50%faster than the Adreno 630. The next gen SoC will not support 5G communications, but it will get an updated NPU for AI applications.
https://www.notebookcheck.net/Kirin-980-core-cluster-and-GPU-details-get-leaked.317852.0.html
Do you not mean the Cortex A-76? I presume this is just a typing error.
We've yet to see any remotely reliable report that GPU Turbo is actually generally applicable instead of heavily reliant on specific cooperation efforts from software devs.