[Razor12911]

Originally Posted by Cesar82

This subject is also of interest, so I ask questions.
This GUID is variable from system to system.
Here there are 6 GUIDs with DedicatedVideoMemory values, one of which is from the ON-BOARD video card.
But the GUID bears no resemblance to those of your images.

How to identify the correct GUID to obtain the video value?

I decided to check where these values really came from
SOFTWARE\Microsoft\DirectX\ - DirectX is a clue so one has to go on msdn
which is here
https://docs.microsoft.com/en-us/win...i_adapter_desc
https://stackoverflow.com/questions/...r-amd/56599035

Also found this Visual Basic code so I translated it to pascal so here

uses
  Winapi.Windows, Winapi.DXGI;

type
  TGPUInfo = record
    FName: String;
    FSize: Integer;
  end;

  TGPUs = array of TGPUInfo;

procedure GetGPUs(out V: TGPUs);
  function Align(Value, Size: Integer): Integer;
  begin
    if Value mod Size <> 0 then
      Result := Succ(Max(0, Value div Size)) * Size
    else
      Result := Value;
  end;

var
  GPUInfo: TGPUInfo;
  i: Integer;
  riid: TGUID;
  hr: HRESULT;
  pFactory: IDXGIFactory;
  pAdapter: IDXGIAdapter;
  dxAdapterDesc: DXGI_ADAPTER_DESC;
begin
  riid := StringToGUID('{7b7166ec-21c7-44ae-b21a-c9ae321ae369}');
  pFactory := nil;
  hr := CreateDXGIFactory(riid, pFactory);
  if (hr = S_OK) and Assigned(pFactory) then
  begin
    pAdapter := nil;
    i := 0;
    while (pFactory.EnumAdapters(i, pAdapter) = S_OK) do
    begin
      FillChar(dxAdapterDesc, SizeOf(DXGI_ADAPTER_DESC), 0);
      hr := pAdapter.GetDesc(dxAdapterDesc);
      if hr = S_OK then
      begin
        GPUInfo.FName := dxAdapterDesc.Description;
        GPUInfo.FSize := IfThen(dxAdapterDesc.DedicatedVideoMemory = 0,
          dxAdapterDesc.DedicatedSystemMemory,
          dxAdapterDesc.DedicatedVideoMemory) div 1048576;
        GPUInfo.FSize := Align(GPUInfo.FSize, IfThen(GPUInfo.FSize < 512,
          32, 512));
        Insert(GPUInfo, V, Length(V));
      end;
      inc(i);
    end;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  i: Integer;
  MyGPUs: TGPUs;
begin
  GetGPUs(MyGPUs);
  for i := Low(MyGPUs) to High(MyGPUs) do
    ShowMessage(MyGPUs[i].FName + ' (' + MyGPUs[i].FSize.ToString + ' MB)');
end;

Would this method work with older operating systems like WindowsXP or Vista, 7, etc?

This works using DXGI which was introduced in Windows Vista.

The value in DedicatedVideoMemory is not correct here.
It should be 4 GB but it results 4239917056 = 4043.5 MB = 3.94 GB.

Actually it is correct, open task manager and you'll see why it is 3.94 GB, I added the align function to help with rounding off 4044 to 4096