As I have repeatedly warned, external modem chips like the MediaTek T900 require legacy memory, specifically, LPDDR4X. While the capacity is 512MB, the severely constrained procurement of this memory will pose a significant issue. Apple is no exception to this.
The Xiaomi XRING O3 used the Mediatek T900 External Baseband with 7.4Gbps Peak Download Speeds.
Furthermore, the G2 Ultra GPU is Clocked at 1.6GHz & has 16 cores.
The SoC has a SLC (System Level Cache) of 16MB & 16MB L3 Cache.