How feasible would it be to load all your CPU cores and the GPU at the same time? Could you just fork off a thread for each core with some SIMD instructions? W

How feasible would it be to load all your CPU cores and the GPU at the same time? Could you just fork off a thread for each core with some SIMD instructions? With 2-8 cores combined, they should be able to give you at least a 10% increase in aggregate processing power.