does nvidia gtx9800 supports double?

Accelerated Computing CUDA CUDA Programming and Performance
1

Does anyone know that the NVIDIA gtx 9800 support double or not?

I was trying to calculate the time required to do a double calculation. Although, I did not get any error message, the calculation time stays constant for 100 double calculation or 1 double calculation.

2

No, it does not.

3

If it doesn’t support double, how come it does not through any error when i compute a double value?

what does it do if I pass a double in GPU?

4

nvcc automatically demotes all doubles to floats when compiled without double support.