How can I get the physical specs about a GPU in D3D12

Question

How can I get the physical specs (memory size, etc.) of a GPU in D3D12? (This would be useful to activate/deactivate some features for specific GPU specs)

Answer 1

With DirectX 12, you do this through the IDXGIAdapter3::QueryVideoMemoryInfo.

See Microsoft Docs

As with most things in DirectX 12, memory management and dealing with VRAM over-commit is left as something the application has to explicitly deal with. Unlike with DirectX 11, it won't degrade gracefully by default. You should take a look at the Residency library sample on GitHub.

Answer 2

An alternative to DXGI is to use DXCore, specifically IDXCoreAdapter::QueryState with DXCoreAdapterState::AdapterMemoryBudget. This will give you access to:

struct DXCoreAdapterMemoryBudget {
  uint64_t budget;
  uint64_t currentUsage;
  uint64_t availableForReservation;
  uint64_t currentReservation;
};