Hi,
Good to know that the RMV tool has been helpful.
You are right that the “TOTAL” memory stat (used by D3D12 resources) does not fully correspond to the “Used Video Memory” stat (for D3D12 memory), which is coming directly from the adapter DXGI method Adapter3->QueryVideoMemoryInfo(0, DXGI_MEMORY_SEGMENT_GROUP_LOCAL, &LocalMemoryInfo) (you probably have found this out already) and may include memory used by other processes or the amount allocated by the driver.
Thanks,
Sam