Ah, sotto GPU... pensavo quella di sistema.
Si è normale.

Shared memory represents normal system memory that can be used by either the GPU or the CPU. This memory is flexible and can be used in either way, and can even switch back and forth as needed by the user workload. Both discrete and integrated GPUs can make use of shared memory.

Windows has a policy whereby the GPU is only allowed to use half of physical memory at any given instant. This is to ensure that the rest of the system has enough memory to continue operating properly. On a 16GB system the GPU is allowed to use up to 8GB of that DRAM at any instant. It is possible for applications to allocate much more video memory than this.
https://devblogs.microsoft.com/direc...-task-manager/