Hi @ all
I have compared the speed of the single precision fft with the speed of the double precision fft. (the parameter are nx 1024 and batch 3500 --> the GPU calculate 3500 FFTs) Here are my results.
single precision: double precision
The double precision fft is 10 time slower than the single precision fft.
I used for the test a GTX 275.
Why is the double precision FFT so slow? (I used the cufft.dll version 2.3 for the test)