Hi Ravil, I have yet to decide on which GPU to buy. I am currently considering the following:
Geforce 210 (CUDA 2.0)
Geforce GT610 (CUDA 2.1)
Geforce GT630 (CUDA 2.1)
Geforce GT640-GDDR3 (CUDA 2.1)
Geforce GT650 (CUDA 3.0)
Geforce GT640-GDDR5 (CUDA 3.5)
As you can see, these GPUs support different CUDA versions (means they have different compute capability). Moreover, they come with various data width (64 vs 128 bits) and memory size (1GB, 2GB and 4GB).
I would like to know which factor (CUDA version, data width or GPU memory size) is the most vital in speeding up the simulation of IFFT/FFT operation in Optisystem.