I would trust NVIDIA and DXDiag as they are more likely to be able to accurately assess the Dual GPU Setup...MS claims an unqualified 6GB of vram. Running tests I'm getting a lot of conflicting results.
Speccy claims to only see 2gb.
Can I run it only sees 3GB.
Nvidia and DX12 check claim 6GB.
Ah good to know. I had no idea that the task manager showed GPU information.