The Dimensity 800U is MediaTek's newest 5G-ready SoC. It comes with two Cortex-A76 cores (2.6GHz), six Cortex-A55 cores (2.0Ghz,) and an ARM Mali-G57 GPU. Other features include support for 120Hz HDR 10+ displays, sub-6GHz SA and NSA 5G networks, LPDDR4X RAM, and UFS 2.2 storage.
https://www.notebookcheck.net/The-Dimensity-800U-is-MediaTek-s-newest-5G-ready-SoC-intended-for-mid-range-smartphones.488010.0.html
I see what they're doing...they're trying to put their whole lineup under the Dimensity name, like all QC SoCs are Snapdragon.