title: Can CUDA use SIMD extensions?
body: <p>I google around a bit, but this is not clear to me now whether some GPUs programmed with CUDA can take advantage or can use instructions similar to those from SSE SIMD extensions; for instance whether we can sum up two vectors of floats in double precission, each one with 4 values. If so, I wonder whether it would be better to use more lighter threads for each of the previous 4 values of the vector or use SIMD. </p>