Performance of Memory Copy between Host and Device with NVIDIA cards

Performance of NVIDIA Geforce 8600

• CudaMemcpyHostToDev=18 microseconds
• CudaMemcpyDevToHost=23 microseconds 

Performance of NVIDIA GTX 580

• CudaMemcpyHostToDev=6 microseconds
• CudaMemcpyDevToHost=8 microseconds

As we can see that NVIDIA new GPGPU cards like GTX series with FERMI memory architecture is much faster by itself than old NVIDIA crds like Geforce series.