Finally, we get to the nitty-gritty of this Mate's iteration—the motherboard:

Micron D9WGR (MT53D1G64D8NZ-046 WT:E) 8 GB LPDDR4 with Kirin 980 SoC layered underneath

Toshiba THGAF8T1T83BAIR 256 GB NAND flash

Samsung K4UHE3D4AA-CGCJ 3 GB LPDDR4X—more on that later

Skyworks 78191-11 low-band front-end module for WCDMA/LTE

HiSilicon Hi6526 PMU

NXP 80T37 (likely NFC controller)

For comparison, the smaller board on the lower left belongs to the Mate 20 Pro.