Switching the GPU

When I fore a query in the cursor with sonet 4
i see the GPU Dedicated momory going up,
How ever i want cursor to use my NVIDIA GPU rather than the Radeon GUP( the Embeded GPU)

it would be nice if i can switch them

Look at the Image, the Readon GPU is full while the NVIDIA is just laying around,
NVIDIA got 10x more dedicated memory than Radeon