Sobel example performance

I installed CUDA and run the sobel edge example, the result shown at the window’s title is nearly 20000 frames/sec, Does that mean my card done this in 0.05ms? I add a cudaThreadSynchronize() before the timer stop and it turn into about 60 fps. Who can tell me how to understand this.

:-) interesting to know… Looks like the author did not time his code correctly…