https://wccftech.com/nvidia-geforce-rtx-3070-modded-with-16-gb-gddr6-memory/

Russian-based modder, VIK-on, has upgraded the NVIDIA GeForce RTX 3070 graphics card with 16 GB GDDR6 memory. The modding required some technical experience but in the end, VIK-on had the RTX 3070 running with twice its original memory capacity.

We have seen modders replace memory modules on NVIDIA GeForce graphics cards before. Teclab did it all the way back in 2019 by modding the GeForce RTX 2080 Ti to support 16 Gbps modules as it featured 14 Gbps modules for stock. Here, we don't see a memory speed upgrade but instead, a capacity boost. The NVIDIA GeForce RTX 3070 originally comes with 8 GB GDDR6 memory & while we have heard several rumors of a higher capacity Ti variant in the past, that does not seem to be the case anymore.