compare cufft in gtx 980 vs gtx 1080

Hi,

I am currently using cufft c2c in gtx 980. Can anyone tell me how much faster will it be in gtx 1080 for large inputs(likely 25M-50M cuComplex).

regards,
siddhartha

Large FFTs are memory bandwidth bound, so to first order FFT performance should reflect the ratio of the memory bandwidth of the two GPUs.

https://www.geforce.com/hardware/desktop-gpus/geforce-gtx-980/specifications 224 GB/sec
https://www.nvidia.com/en-us/geforce/products/10series/geforce-gtx-1080 320 GB/sec

So that looks like you could expect a 1.4x performance increase. I do not have either of those GPUs available to me, so cannot verify my hypothesis.

If the exact performance increase is important to you, the safest approach would be to “try before you buy”, e.g. by borrowing a GTX 1080 for benchmarking purposes.