HIP + CUDA rendering time in Cycles

Hello everyone.
I’ve bought recently a new AMD Radeon 6700xt, and the HIP support for Cycles is so amazing!
But unfortunately I noticed that I cannot use it togheter my old GTX 1050ti.
One of HIP feature is to be compatible with CUDA’s applications, so I’ve tried to combine both into Blender 3.0.1 and this is the final result: