RTX 3070 Upgraded to 16 GB.
https://www.youtube.com/watch?v=W6uaUHBNFOU

NVIDIA RTX 3060 8GB becomes RTX 3060 12GB
https://www.youtube.com/watch?v=2XNolRHVFOE

Test results GeForce RTX 3060 8 Gb GeForce RTX 3060 12 GB

The result of adding memory is more than 20% performance.
I don't know how effective it is in mining, but finally someone hacked Nvidia.